The interpretation of ultrasound readings is carried out by two specialists - a doctor who conducts an ultrasound examination, and a leading gynecologist. The ultrasound doctor issues a conclusion with the established gestational age and information about the existing pathologies of fetal development or their absence. The gynecologist also assesses the degree of pathologies and decides what to do next for the pregnant woman.
Why do you need an ultrasound during pregnancy
Conducting an ultrasound analysis is caused by the need to examine the child in the womb for its pathologies or their absence.
ultrasound on early dates is carried out to determine the presence of pregnancy and its duration, the number of fetal eggs. This way of research is useful in that it can reveal an ectopic pregnancy - a dangerous condition that requires immediate medical intervention, up to surgical methods. If, with the help of ultrasound, this pathology is detected at the initial stages, the pregnant woman has the opportunity to avoid surgical intervention.
At the stage first screening (11-13 weeks) the walls of the uterus, the uterus itself and its appendages are studied, and the following indicators of the growth of the embryo are considered:
- chorion - it contributes to the development of the placenta;
- The yolk sac is an important component for the development of the embryo.
At the next ultrasound helps to identify existing pathologies, such as, the threat of miscarriage,. It is the timely diagnosis of deviations that helps to eliminate them and avoid subsequent complications.
At the second screening a number of indicators are examined, which then will need to be deciphered:
- examining the uterus the fallopian tubes and condition of the ovaries;
- fetometry is carried out, with the help of which the sizes of individual parts of the fetus are established and their compliance with the gestational age is assessed;
- the state of the organs that connect the child with the mother (placenta, umbilical cord) is studied, the structure of the amniotic fluid is assessed;
- the state is analyzed internal organs child.
On this ultrasound, some pathologies can be traced, such as oligohydramnios or too low attachment of the placenta. Thanks to ultrasound, it is possible to establish both curable and incurable fetal defects.
Third screening carried out for the following purposes:
- identification of serious fetal malformations that cannot be detected in the early stages;
- determination of fetal presentation (gluteal or head);
- determination of the body weight of the child;
- assessment of the risk of abnormal formation of the brain;
- examination for a subject;
- evaluation of the fetal heart rate - rapid or rare;
- assessment of fetal growth;
- assessment of the risk of developing heart defects in the fetus.
On ultrasound in the third trimester, you can already see the baby's lungs and their readiness to work in a normal environment in case of premature birth. In the last screening, great attention is paid to the skull, abnormalities such as cleft palate, cleft lip, etc. are monitored.
On the eve of the birth itself, ultrasound allows you to find out some of the nuances that may be important for the birth process itself. In particular, only thanks to ultrasound it is possible to see the entwined umbilical cord with 100% accuracy, and this is a very important aspect in the birth process, because it can become a threat both to the health of the baby and to his life.
Some pregnant women are prescribed Ultrasound more often than expected. These pregnant women include those who have: diabetes mellitus, blood and lymph diseases, negative Rh factor.
Deciphering fetal ultrasound
Already starting from the 11th week of pregnancy, the detection of fetal pathologies is allowed. In Russia, two main standard protocols are defined, according to which data is decrypted.
These studies are conducted at 11-13 weeks of pregnancy and at 19-22 weeks. In order to more accurately decipher the data, you need to know the norms of fetal development on different stages gestation.
At this time, a detailed examination of the collar zone of the fetus is carried out - the area between the tissues and the skin in the neck area. The thickness of the collar zone is abbreviated as TVP. Normally, TVP should not exceed 2.7 mm.
The nasal ossicle is another parameter that is being investigated at this time. Normally, the bone should be visualized.
Another indicator that is measured at this stage is KTR (coccyx-parietal size of the fetus).
For a kid at 11 - At week 13, the KTR is considered to be within 45-80 mm.
In addition to KTR, the doctor evaluates the biparietal and fronto-occipital dimensions of the fetus. The first is the distance from one temple of the head to another and is normally up to 28 mm. The second - the distance from the frontal to the occipital bone - normally does not exceed 31 mm.
* Percentile is a descriptive statistics term. The average value is indicated in the "50th percentile" column, in the "5th percentile" and "95th percentile" columns - the minimum and maximum allowable values, respectively.
Separately, the doctor evaluates the diameter of the fetal egg ...
... and calculates the heart rate (HR).
If the indicators do not correspond to the norm, the pregnant woman is recommended to undergo a consultation with a geneticist and an additional examination.
Second fetal screening
The norms of fetal development in the second trimester are shown in the table:
* Percentile is a descriptive statistics term. The average value is indicated in the "50th percentile" column, in the "5th percentile" and "95th percentile" columns - the minimum and maximum allowable values, respectively.
If there are any changes in these indicators, deviations in the development of the child in the womb can be assumed. By the way, during the second screening, the fetus is seen much better than during the first one, so the doctor can judge not only genetic abnormalities, but also other defects (they are recorded separately in the examination protocol).
As part of the third screening, such parameters of the baby as height, weight, biparietal head size, hip length and chest. The norms of the listed parameters are described in the table above. Below are the normal indicators of BDP and LZR.
* Percentile is a descriptive statistics term. The average value is indicated in the "50th percentile" column, in the "5th percentile" and "95th percentile" columns - the minimum and maximum allowable values, respectively.
During the 3rd screening, the doctor evaluates the condition of the placenta, its degree of maturity and thickness. The placenta is the link between a mother and her baby. It remains for the entire duration of pregnancy. It exists in order to nourish the child with the necessary nutrients.
IAI norms (amniotic fluid index)
Fetal size by week of pregnancy
Each trimester has its own research and measurements. The interpretation of ultrasound indicators helps to establish the size of the child at the time of its development.
Below is a table of the size and weight of the fetus by week. It is worth saying that the readings are average, may differ from reality. This is especially true in the last months of pregnancy.
A newborn can be born with a weight of 2300 grams, or it can be born with a weight of 4500 grams. And in fact, and in another case, he can be absolutely healthy.
|
Term in weeks |
Height in cm |
Weight in g |
|
6-9 |
11-16 |
|
|
9-11 |
16-21 |
|
|
10-12 |
20-30 |
|
|
12-14 |
30-50 |
|
|
14-16 |
50-75 |
|
|
16-18 |
75-115 |
|
|
18-20 |
115-160 |
|
|
20-22 |
160-215 |
|
|
22-24 |
215-270 |
|
|
24-26 |
270-350 |
|
|
26-28 |
350-410 |
|
|
28-30 |
410-500 |
|
|
30-32 |
500-600 |
|
|
32-34 |
600-750 |
|
|
34-36 |
750-850 |
|
|
36-37,5 |
850-1000 |
|
|
37-39,5 |
1000-1200 |
|
|
38-40 |
1200-1350 |
|
|
39-40 |
1350-1500 |
|
|
40-41 |
1500-1650 |
|
|
41-42,5 |
1650-1800 |
|
|
43-44,5 |
1800-1950 |
|
|
44,5-45 |
1950-2100 |
|
|
44,5-46 |
2100-2250 |
|
|
46-46,5 |
2250-2500 |
|
|
46,5-48 |
2500-2600 |
|
|
48-49 |
2600-2800 |
|
|
49-50 |
2800-3000 |
|
|
50-51 |
3000-3200 |
|
|
51-54 |
3200-3500 |
Ultrasound examination of the placenta
Ultrasound of the placenta determines its size, echostructure, development.
When the placenta may be hyperthick:
at detachment;
with Rhesus conflict;
with dropsy of the embryo;
mild thickening may occur in women with diabetes mellitus;
if in the process of bearing a pregnant woman suffered an infectious disease.
The placenta has the same functions as human body- it tends to be born, mature and fade. All these moments are absolutely natural. But if it happens, it is a pathology.
Exists 3 degrees of maturity of the placenta:
Idegree of maturity. Until the 30th week of pregnancy, the placenta is at the zero degree of maturity. At this time, it increases in size, nourishing the baby with all the useful elements. The structure is normally homogeneous, smooth. After 30 weeks, specks and waves may appear on the placenta, which indicate the beginning of the maturation of the placenta. If the appearance of these signs is detected earlier, then this process is called "premature aging of the placenta." In some cases, prescribed to women drug treatment. The first degree should last up to 34 weeks.
IIdegree of maturity. This degree comes from 34 to 37 weeks. It already looks more prominent, wavy, the ultrasound shows an echostructure with speckles. If the second degree is indicated earlier than 34 weeks, then more detailed diagnostics and fetal CTG will need to be performed. All tests as a whole will show if there are any fetal pathologies. If the child suffers from hypoxia, outpatient treatment may be prescribed.
IIIdegree of maturity. This degree is established already at full-term pregnancy. The placenta is preparing for childbirth and its functions are reduced, its natural aging occurs. There are large waves and salt deposits all over the surface.
If the placenta does not correspond to its term, then there is a risk of premature birth.
Ultrasound of the umbilical cord of the fetus
An umbilical cord passes between the placenta and the fetus, which connects them together. Ultrasound examination determines the number of vessels in the umbilical cord, their condition, structure.
The umbilical cord has two arteries and one vein that feed the fetus. The vein saturates the fetus with oxygen, and the arteries serve as the output of processed products.
The length of the umbilical cord should normally be at least 40 cm.
Ultrasound allows you to see the entanglement of the umbilical cord, if any. Establishment of entanglement is not yet a reason for a caesarean section.
Ultrasound examination of amniotic fluid
In the process of ultrasound, the amniotic index is calculated, which indicates the amount of water. The index is measured according to a certain scheme:
the uterus is divided into two perpendicular strips, one goes along the navel line, the other longitudinally;
in each sector, measurements of the free distance between the fetus and the wall of the uterus are made;
indicators are summed up.
Normal values at week 28 will be AI readings of 12-20 cm. An increase in the value may indicate polyhydramnios, a decrease in indicators, respectively, of oligohydramnios.
* Percentile is a descriptive statistics term. The average value is indicated in the "50th percentile" column, in the remaining columns - the minimum and maximum allowable values, respectively.
In any case, this or that deviation indicates violations in the blood supply to the placenta.
Ultrasound of the uterus during pregnancy. The size of the uterus by week of pregnancy
When conducting an ultrasound of the uterus, its size is measured, it is examined appearance for the presence of myomatous nodes, muscle tone, the thickness of the walls of the uterus is measured.
Before pregnancy, the thickness of the walls of the uterus is 4-5 cm, by the end of pregnancy, the uterus is stretched, its walls become thinner and are approximately 0.5-2 cm.
The normal length of the cervix is 3.5-4.5 cm.
Marianna Artemova, obstetrician-gynecologist, specially for website
How the baby grows and whether everything is in order with him, the doctor and spouses who are preparing to become parents will be helped to find out by ultrasound diagnostics. At the very initial stage, when the size of the baby is still quite microscopic, the main criterion for the well-being of the baby is the so-called KTP. About what it is, what it can be, and what to do if there are deviations, we will tell in this material.
What it is
The abbreviation "KTR" is not an analysis and not a research method, but the name of one of the sizes that are determined by ultrasound by a somnologist. Reduction is a complex term - the coccyx-parietal size. This concept means the distance from the highest point of the crown of the embryo and fetus to the lowest point of its coccyx in a position in which the baby's body is fully extended.
KTR is not height and not overall length, as some people think. It's just segment from the head to the extreme point of the future spine, but for now - the neural tube. This parameter is measured from the earliest gestational age to 14 weeks.
After that, the baby becomes too large for the ultrasonic sensor to cover such a distance at a time, and the individual sizes of the parts of the child's body come to the fore, by which the doctor judges the proportions, growth rates and development of the fetus.
KTR begin to measure almost immediately after the fact of pregnancy becomes apparent. To find out if there is a pregnancy at all, a woman can use ultrasound at about week 5, that is, 21 days after ovulation or about a week after the start of a delay in the next menstruation.
Coccyx-parietal size can be measured about a week later, on the sixth obstetric week , that is, about a month after conception.
The growth rate of the KTR tells the doctor how the baby is growing. In the early stages - this is the only thing that can talk about the well-being or trouble of pregnancy. The values of the coccygeal-parietal size are supplemented by data on the viability of the crumbs, because from about 5 weeks on the ultrasound, a heartbeat is visible.
The tiny heart is not yet fully formed, but the characteristic pulsation will not hide from the experienced look of a good specialist and a modern ultrasound scanning machine equipped with a sensor with a highly detailed picture.
All babies grow at about the same rate in the first weeks of pregnancy. A little later, when the genetic characteristics of the child begin to appear, the ultrasound data in different pregnant women will have significant differences. With two pregnancies occurring on the same day and even an hour, the children will differ in size and body proportions, because they have different parents in terms of complexion, different heredity, different conditions for intrauterine growth.
In the short term, all embryos are almost the same, and they develop not due to hereditary characteristics, but according to the laws of nature. Therefore, KTR is considered one of the most accurate methods for determining the duration of pregnancy. Accuracy at the same time - until each day after conception.
KTR does not depend on race, skin color, nationality of parents, on ecology and geographical latitude. The only thing that theoretically can affect the coccyx-parietal size is features of the state of health of both the expectant mother and the baby himself, because even for a short period, literally from the first minutes after conception, all the information about what the baby’s health will be like is embedded in its genetic code - the karyotype.
How is it measured?
The only way to measure CTE is sagittal scanning. If the baby is moving too fast, the doctor waits until he is fully extended to take a freeze frame.
The sagittal plane visually divides the small body in half. The segment that the doctor lays from the crown of the head to the coccyx is measured special program embedded in the scanner. The value obtained correlates with existing tables, which indicate normal CTE values depending on the gestational age. The accuracy of the study is plus or minus 3-4 days.
In this way, this size allows you to set the exact gestational age in case it is necessary. Such a need may arise in women suffering from irregular menstrual cycle who do not remember the exact date of the beginning of the last menstruation. This date is considered the starting point. obstetric term pregnancy.
The first day of your last period is considered the first day of pregnancy. That is, the obstetric period differs from the actual one by almost 2 weeks or more.
The coccygeal-parietal size of the fetus will allow you to set the exact date even if the doctor suspects a delay in the development of the embryo, because it is possible that ovulation occurred later than the woman thinks, or implantation occurred a little later than the average time. Then the actual age of the fetus will be less, which will be told by the KTR determined by ultrasound.
KTR norms
As already mentioned, embryos grow at about the same rate if the pregnancy develops safely. Existing tables are considered a fairly reliable way to assess growth and clarify the gestational age. Therefore, in relation to the coccygeal-parietal size in the early stages, no possible fluctuations of the determined parameter to the smaller side are indicated.
The values are quite accurate. But this is only for the shortest periods. As the baby grows, permissible errors appear in the KTR - the upper and lower thresholds of the norm.
Table of normal CTE values \u200b\u200band compliance with gestational age:
gestational age (week + day) | The smallest value of CTE, mm | Average value of CTE, mm | Maximum KTP value, mm |
|||
not defined | ||||||
not defined | ||||||
not defined | ||||||
not defined | ||||||
not defined | ||||||
not defined | ||||||
not defined | not defined | |||||
In this way, it is not difficult to establish the exact gestational age. The values in the ultrasound protocol for a particular woman can be indicated without tenths, only whole numbers. It all depends on how modern the device and the sensitive sensor were when making the measurement.
Older devices specify the value in integers. Scanners latest generation, which modern perinatal centers and clinics are equipped with, can determine KTR with an accuracy of up to a tenth.
You should not try to "adjust" your values to the average values \u200b\u200bto every tenth. If, according to the results of the ultrasound, it is written that the CTE of the fetus \u003d 1 mm, it can be 1.1 and 1.5 mm. If it is indicated that CTE = 23.7, this corresponds to 9 weeks and 1 day from conception with an error of + 1 day. Similarly, CTE = 61 mm corresponds to a period of 12 weeks and 5 days, although the tenths of the values are different in the table.
Possible problems and their causes
During pregnancy, women become incredibly sensitive, especially to everything related to the development and health of the baby. If there are no special problems in the early stages, the woman does not complain about anything, then there is no need to go for an ultrasound until 10-13 weeks. In the indicated terms, the first “meeting” of the mother with the baby usually takes place.
Naturally, it is the KTR of the fetus and all the issues and problems related to this that become an important topic for discussion at women's forums and in the communities of parents. The most common of them should be considered in more detail.
CTE less than normal
This situation occurs frequently, and it is she who causes the largest number suffering and worries for expectant mothers. The lag of the coccyx-parietal size from the norm can be both physiological and pathological. For example, at week 11, the baby barely approached week 10 in terms of KTR size. Naturally, the pregnant woman begins to get upset and look for the reasons for this phenomenon.
It's not all bad, experts say. Indeed, most often the reason lies not in the pathologies of the fetus and not in the diseases of the mother, but in a banal error that crept into the calculation of the term pregnancy. When a woman goes to the gynecologist about a delay in menstruation, and the doctor confirms the fact of pregnancy, he counts from the first day of the last menstruation.
If the woman made a mistake with the date, then the date will be set incorrectly. If ovulation is late or the implantation of the fetal egg into the uterine cavity occurs later, then the TRK will be less than normal just for the period for which the delay occurred.
A second ultrasound will help to check or refute this version, which is usually prescribed a week and a half after the first ultrasound scan. In case of an error in calculating the term, KTR will increase in proportion to the actual term, and further pregnancy management will be carried out according to the corrected data.
The reason for the backlog of the coccygeal-parietal size from the existing standard values may be the death of the fetus. If for some reason the baby stopped developing, and the miscarriage did not occur, his KTR will be at the level at which he is at the time of death.
If the period is still small, and it is difficult to reliably determine the fact of the fetal heartbeat, then repeated ultrasound is desirable in 5-6 days to make sure the baby is not growing.
In this case, obstetric curettage of the uterine cavity or medical termination of pregnancy without surgical intervention is indicated (with a fetal period of less than 6 weeks). Further treatment with antibiotics is possible.
During obstetric curettage, tissue samples from the embryo are taken for genetic analysis to determine the cause of its death. Most often, it lies in total chromosomal disorders, in which further development embryo was not possible.
The lag in KTR values for more than two weeks is a reason for a more detailed examination. If the baby is alive and developing, but its coccygeal-parietal size is significantly different from the norm, the reason may be hidden in the hormonal background of the mother.
The lack of such a hormone as progesterone affects the development of the baby at the very initial stage. If a blood test shows that the hormone is not enough, then the woman is prescribed hormone therapy. With drug support, the hormonal background normalizes, and the baby will quickly begin to gain what he “missed”, the KTP will become normal.
The reason for the reduction of the coccygeal-parietal size may be the distress that he experiences due to infectious or chronic diseases of the mother. The prognosis in this case depends on the specific disease or infection. If it is possible to start treatment, the doctor will definitely prescribe it.
KTR is more than normal
The coccyx-parietal size may be larger than normal, and this also worries expectant mothers. Exceeding this indicator is also characteristic of women who cannot accurately remember the date of the last menstruation. An error in calculating the obstetric period can also occur in women with early ovulation.
Early release of the egg may occur due to recent infectious disease, for example, influenza or SARS, as well as in women who took hormonal preparations for the treatment of infertility.
Thus, the period may be longer than the doctor expects, and the size of the CTE will unequivocally say this. To confirm or deny the version, the woman will be asked to come back to the ultrasound doctor's office in about 10 days.
If the KTR grows symmetrically to the term, and at the same time it consistently exceeds the norm by days and weeks, further maintenance will be carried out taking into account these adjustments. The dates will be recalculated, the expected date of birth will be postponed to an earlier date.
If the CTR of the baby is constantly at or above the upper limit, doctors may suspect that the woman has a tendency to develop a large or even giant fetus.
A large baby in obstetrics is considered to be a baby who is born weighing over 4 kilograms. A giant fetus is a baby that weighs more than 5 kilograms at the time of birth.
Such women are not recommended to take vitamin complexes, eat a lot, expectant mothers are supposed to visit a doctor more often. The diagnosis itself large fruit"Officially at the beginning of pregnancy they do not put. This happens much later, in the third trimester. But the suspicion of a large or giant baby may arise in the early stages.
You should not assume that the tendency towards a large baby is an excess of KTR from the norm by 1-2 mm. The doctor can talk about the trend when, for example, at week 13, the CTE at a rate of 63 mm and an upper threshold of 75 mm will be over 80 mm.
Before assuming a hero, mom will check the level of sugar in the blood. Often women with diabetes have a predisposition to the birth of large children. Such a pregnancy will require special management and attitude.
KTP is growing slowly
Sometimes a woman may face a special problem - the slow growth of KTP. They talk about such a phenomenon if the embryo shows signs of life (from the 5th week - a heartbeat, from - motor activity), but at the same time, the growth of the crumbs is slowed down and, over time, more and more lags behind the existing norms. There may be several reasons for this phenomenon, almost all of them are pathological in nature.
Growth may slow down due to genetic disorders. While the period is too short, it is not possible to establish this reliably. The first screening, which is carried out between 10 and 13 weeks inclusive, will be able to clarify the situation.
If the baby has congenital pathologies, special markers in the blood of a pregnant woman on an ultrasound picture will affect the establishment of a high risk for Down syndrome, Patau, Turner or other pathologies.
It is clear that it is absolutely unbearable for a woman to wait and suffer. The only way to find out if the baby is healthy before screening is a non-invasive prenatal DNA test. It can be carried out after the 8th week of pregnancy in medical genetic centers and genetic clinics.
Blood is taken for analysis from a vein, it can already determine the individual red blood cells of the child. From them, the DNA of the baby is isolated, and the probability of a chromosomal abnormality is determined by the karyotype.
The analysis is very expensive - several tens of thousands of rubles, it is not available to everyone. The package is mandatory health insurance such an analysis is not included, so it will not work for free.
The reason for the slow growth of the embryo may also be the insufficiency of the endometrium of the uterus, if not so long ago the woman had an abortion. After an abortion, it is recommended to wait a certain period until the next pregnancy, but in reality this does not always work out for everyone.
If this happened, and in addition to the low growth rate of CTE, the doctor states cervical erosion or cervical eversion towards the vagina (ectropion), then the forecasts are rather doubtful. The risk of miscarriage is very high. A woman needs hospitalization, in a hospital there is a chance to save the baby and give him the opportunity to grow and develop according to the deadline.
A slow "increase" in KTR is also characteristic of Rh-conflict pregnancy. If a woman with Rh negative has already had several births or caesarean sections, and Rh-positive babies were born, then the sensitization of the mother's body can be so strong that antibodies will begin to grow literally from the first weeks of the next pregnancy.
In this case, the forecasts are also quite doubtful. Everything will depend on the specific situation, the level of antibodies in the mother's blood.
KTR is growing too fast
Such situations occur infrequently, but they cannot be ruled out. On average, up to 12 weeks, the growth of the baby is added by 1 mm per day, after this period, the baby begins to grow faster. If the measurements were taken at week 11, and then the ultrasound was repeated at week 14 for some reason, then the growth may indeed look rapid.
If growth increases above the norm and at an earlier date, then the main reasons that doctors will consider are metabolic disorders in the mother's body, congenital pathologies of the fetus and Rhesus conflict. The rapid growth of the fetus by weeks may be accompanied by maternal problems with hyperthyroidism.
For all nine months of bearing a child future mom she is very worried about how well her baby develops.
Regular visits to the doctor, compliance with his recommendations and mandatory examinations will help you monitor the course of pregnancy.
The most optimal diagnostic method is considered to be visited by pregnant women several times. It is this study that will help track the growth and development of the child literally by weeks and even days.
Significant deviations from the norm will indicate any violations or other problems, the timely detection of which will make it possible to correct the situation and help the mother and baby.
This concept refers to an assessment tool that is given by experts in all indicators: the growth rate of the baby, the symmetry of its development, and also the correspondence of these data to your gestational age.
Based on the figures obtained, the doctor will be able to draw conclusions and predict the further development and formation of the child.
What will be measured?
To assess the condition, the doctor will record the indicators of many parameters.
They are different for every period. In the first trimester (from 8 to the end of 13 weeks), only a few possible ones are measured:
- the most important indicator is the coccygeal-parietal size (CTE). At this time, it is impossible to measure the bent legs of the child, so the figure is taken from the head (temechka) to the coccyx;
- as part of the screening study, the thickness of the collar space (NTP) and the size of the nasal bone are measured (these indicators are markers by which doctors can assume the development of congenital malformations and developmental anomalies);
- also evaluated, its weight, the presence and development of various internal organs.
KTP is measured up to a maximum of 14 weeks. The value of the indicators depends on the gestational age and allows you to determine it to the nearest day, because the child grows in height every day.
However, already at the second planned ultrasound, other indicators appear that become more important for the study:
- biparental size (BDP) - the distance that is measured between the two widest points of the baby's head (this indicator can also be observed in the early stages, but then it does not matter as much as KTR);
- fronto-occipital size (LZR) or longitudinal line;
- values of the circumferences of the head and tummy, the diameter of the abdomen and chest girth;
- limb length and tubular bones(bones of the lower leg, forearm, femur and humerus and others).
The symmetry of all sizes of the child, his weight, and the correspondence of indicators to a specific period are also evaluated. In addition, other indicators also matter: the quality and size, and the place of attachment of the placenta, the assessment of the umbilical cord and cervix.
At a later date, doctors look and additionally determine the position and presentation of the baby in order to be able to predict the method of delivery.
Norms of the main dimensions of the fetus
There are special tables that indicate the average parameters of all indicators.
Keep in mind that absolutely all babies develop in different ways, and even if some figures for the size of your child do not match the tabular norms, this is not a reason to panic: it is possible that the lag behind the average parameters is simply due to the usual individual characteristics organism.
The same goes for exceeding standards. The doctor will definitely take repeated measurements after some time in order to track the dynamics of growth.
An alarming signal will only be a significant difference up or down in all parameters, recorded several times in a row.
Biometric indicators are measured at each ultrasound (the calculation is in percentiles: from 10 to 95 - fluctuations within the normal range, 50th percentile - its average indicator). As a rule, doctors take the average figure as a basis, but focus on the minimum and maximum size of the parameters.
Table. Fetal size by week of pregnancy
| week of pregnancy | Length cm | KTR, mm | Fronto-occipital size (LZR), mm | BPR, mm | Abdominal circumference, mm | Head circumference, mm | Femur, mm | Lower leg bones, mm | Forearm bone length, mm | Humerus length, mm |
| 8 | 1,6 | 10-18 | – | – | – | – | – | – | – | – |
| 9 | 2,3 | 16-27 | – | – | – | – | – | – | – | – |
| 10 | 3,1 | 24-38 | – | – | – | – | – | – | – | – |
| 11 | 4,1 | 34-50 | – | 13-21 | 40-62 | 53-73 | 3,4-7,8 | – | – | – |
| 12 | 5,4 | 42-59 | – | 18-24 | 50-72 | 58-84 | 4,0-10,8 | – | – | – |
| 13 | 7,4 | 51-75 | – | 20-28 | 58-80 | 73-96 | 7,0-11,8 | – | – | – |
| 14 | 8,7 | 63-89 | – | 23-31 | 66-90 | 84-110 | 9,0-15,8 | – | – | – |
| 15 | 10,1 | – | – | 27-35 | 90 | 110 | 16,2 | – | – | – |
| 16 | 11,6 | – | 41-49 | 31-37 | 88-116 | 112-136 | 17-23 | 15-21 | 12-18 | 15-21 |
| 17 | 13 | – | 46-54 | 34-43 | 93-131 | 121-149 | 20-28 | 17-25 | 15-21 | 17-25 |
| 18 | 14,2 | – | 49-59 | 37-47 | 104-144 | 131-161 | 23-31 | 20-28 | 17-23 | 20-28 |
| 19 | 15,3 | – | 53-63 | 41-49 | 114-154 | 142-174 | 26-34 | 23-31 | 20-26 | 23-31 |
| 20 | 16,4 | – | 56-68 | 43-53 | 124-164 | 154-186 | 29-37 | 26-34 | 22-29 | 26-34 |
| 21 | 26,7 | – | 60-72 | 46-56 | 137-177 | 166-200 | 32-40 | 29-37 | 24-32 | 29-37 |
| 22 | 27,8 | – | 64-76 | 48-60 | 148-190 | 178-212 | 35-43 | 31-39 | 26-34 | 31-39 |
| 23 | 28,9 | – | 67-81 | 52-64 | 160-202 | 190-224 | 37-45 | 34-42 | 29-37 | 34-42 |
| 24 | 30 | – | 71-85 | 55-67 | 172-224 | 201-237 | 40-48 | 36-44 | 31-39 | 36-44 |
| 25 | 34,6 | – | 73-89 | 58-70 | 183-229 | 214-250 | 42-50 | 38-46 | 33-41 | 39-47 |
| 26 | 35,6 | – | 77-93 | 61-73 | 194-240 | 224-262 | 45-53 | 41-49 | 35-43 | 41-49 |
| 27 | 36,6 | – | 80-96 | 64-76 | 205-253 | 235-273 | 47-55 | 43-51 | 37-45 | 43-51 |
| 28 | 37,6 | – | 83-99 | 67-79 | 217-265 | 245-285 | 49-57 | 45-53 | 39-47 | 45-53 |
| 29 | 38,6 | – | 86-102 | 70-82 | 228-278 | 255-295 | 50-60 | 48-55 | 40-48 | 47-55 |
| 30 | 39,9 | – | 89-105 | 71-85 | 238-290 | 265-305 | 52-62 | 49-57 | 42-50 | 49-57 |
| 31 | 41,1 | – | 93-109 | 73-87 | 247-301 | 273-315 | 54-64 | 50-60 | 44-52 | 51-59 |
| 32 | 42,4 | – | 95-113 | 75-89 | 258-314 | 283-325 | 56-66 | 51-61 | 45-53 | 52-59 |
| 33 | 43,7 | – | 98-116 | 77-91 | 267-325 | 289-333 | 58-68 | 53-63 | 46-54 | 54-62 |
| 34 | 45 | – | 101-119 | 79-93 | 276-336 | 295-339 | 60-70 | 55-65 | 48-56 | 55-63 |
| 35 | 46,2 | – | 103-121 | 81-95 | 285-345 | 299-345 | 62-72 | 56-66 | 49-57 | 57-65 |
| 36 | 47,4 | – | 104-124 | 83-97 | 292-354 | 303-349 | 64-74 | 57-67 | 50-58 | 58-66 |
| 37 | 48,6 | – | 106-126 | 85-98 | 299-361 | 307-353 | 66-76 | 59-69 | 51-59 | 59-67 |
| 38 | 49,8 | – | 108-128 | 86-100 | 304-368 | 309-357 | 68-78 | 60-70 | 52-60 | 60-68 |
| 39 | 50,7 | – | 109-129 | 88-102 | 310-374 | 311-359 | 69-80 | 61-71 | 53-61 | 60-70 |
| 40 | 51,2 | – | 110-130 | 89-103 | 313-381 | 312-362 | 70-80 | 62-72 | 54-62 | 61-71 |
Conclusion
The scorecard contains average data that helps doctors determine how symmetrical your child is developing. The measurement of the parameters of the baby is supplemented by other studies ‒
1st week
Your baby is still in the plans
Your last period has just started and you are already planning a pregnancy.
2nd week
moment of conception
Pregnancy occurs on the 14th day. As a result of ejaculation, millions of spermatozoa move through the vagina through the fallopian tube. Only one sperm can get to the egg. This is the moment of conception.
3rd week
Fruit size:
A blastocyst is formed - a hollow, fluid-filled germinal vesicle, a cluster of cells: it is still barely visible to the naked eye and its size is about 0.1-0.2 mm in diameter.
4th week
Fruit size:
In one week, the baby almost doubles in size: its length does not exceed half a millimeter.
5th week
Fruit size:
Per last week the baby has doubled in size: now its length is 1.5 mm.
Inner diameter (mm) – 18
Area (mm2) – 245
Volume (mm3) – 2187
The average size of the embryo
Coccyx-parietal size (mm) – 3
6th week
Fruit size:
The length of the baby now reaches 4 mm.
The average size of the ovum in the first trimester of pregnancy
Inner diameter (mm) – 22
Area (mm2) - 363
Volume (mm3) – 3993
The average size of the embryo
Coccyx-parietal size (mm) – 6
– 3
7th week
fruit weight:
Fruit size:
The length of the baby now reaches 1.5 cm, and at this stage almost half of it falls on a disproportionately large head.
The average size of the ovum in the first trimester of pregnancy
Inner diameter (mm) – 24
Area (mm2) – 432
Volume (mm3) – 6912
The average size of the embryo
Coccyx-parietal size (mm) – 10
Yolk sac diameter (mm3) – 4
8th week
fruit weight:
The length from the crown to the sacrum is approximately 8-11 mm.
Weight - about 1.5 g.
Fruit size:
Its length from crown to tailbone is 2.2 cm and is called, respectively, the parietal-coccygeal length. This expression applies even after the legs have grown to full length - since they are often bent, this makes it difficult to take measurements from the crown to the heels.
With what to compare?
Now, in size and shape, the baby resembles a cashew nut.
The average size of the ovum in the first trimester of pregnancy
Inner diameter (mm) – 30
Area (mm2) – 675
Volume (mm3) – 13490
The average size of the embryo
Coccyx-parietal size (mm) – 16
Biparietal size (mm) – 6
Yolk sac diameter (mm3) – 4,5
9th week
fruit weight:
Weight - about 2 g.
Fruit size:
The length from the crown to the sacrum is approximately 13-17 mm.
The average size of the ovum in the first trimester of pregnancy
Inner diameter (mm) – 33
Area (mm2) – 972
Volume (mm3) – 16380
The average size of the embryo
Coccyx-parietal size (mm) – 23
Biparietal size (mm) – 8,5
Yolk sac diameter (mm3) – 5
10th week
fruit weight:
Weight - about 4 g.
Fruit size:
The length from the crown to the sacrum is approximately 27-35 mm.
The average size of the ovum in the first trimester of pregnancy
Inner diameter (mm) – 39
Area (mm2) – 1210
Volume (mm3) – 31870
The average size of the embryo
Coccyx-parietal size (mm) – 31
Biparietal size (mm) – 11
Yolk sac diameter (mm3) – 5,1
11th week
fruit weight:
The length from the crown to the sacrum is approximately 55 mm.
Weight - about 7 g.
Fruit size:
The average size of the ovum in the first trimester of pregnancy
Inner diameter (mm) – 47
Area (mm2) – 1728
Volume (mm3) – 55290
The average size of the embryo
Coccyx-parietal size (mm) – 41
Biparietal size (mm) – 15
Yolk sac diameter (mm3) – 5,5
Height and weight by ultrasound
Height (cm) - 6,8
Weight (g) - 11
Thigh length (mm) – 7
chest diameter(mm)– 20
12th week
fruit weight:
The length from the crown to the sacrum is approximately 70-90 mm.
Weight - about 14-15 g.
Fruit size:
The average size of the ovum in the first trimester of pregnancy
Inner diameter (mm) – 56
Area (mm2) – 2350
Volume (mm3) – 87808
The average size of the embryo
Coccyx-parietal size (mm) – 53
Biparietal size (mm) – 20
Yolk sac diameter (mm3) – 6
Height and weight by ultrasound
Height (cm) - 8,2
Weight (g) - 19
Thigh length (mm) – 9
chest diameter(mm)– 24
13th week
fruit weight:
The length from the crown to the sacrum is 10.5 cm.
Weight - approximately 28.3 g.
Fruit size:
The average size of the ovum in the first trimester of pregnancy
Inner diameter (mm) – 65
Area (mm2) – 3072
Volume (mm3) – 131070
The average size of the embryo
Coccyx-parietal size (mm) – 66
Biparietal size (mm) – 24
Yolk sac diameter (mm3) – 5,8
Height and weight by ultrasound
Height (cm) - 10
Weight (g) - 31
Thigh length (mm) - 12
chest diameter(mm)– 24
14th week
fruit weight:
Length from crown to sacrum -12.5 - 13 cm.
Weight - about 90-100 g.
Fruit size:
Biparietal size (mm) – 26
Skull perimeter (mm) – 80
Skull area (mm2) – 510
Height and weight by ultrasound
Height (cm) - 12,3
Weight (g) - 52
Thigh length (mm) - 16
chest diameter(mm)– 26
15th week
fruit weight:
The length from the crown to the sacrum is 93-103 mm.
Weight - about 70 g.
Fruit size:
Average size of the fetal head
Biparietal size (mm) – 32
Skull perimeter (mm) – 90
Skull area (mm2) – 675
Height and weight by ultrasound
Height (cm) - 14,2
Weight (g) - 77
Thigh length (mm) - 19
chest diameter(mm)– 28
16th week
fruit weight:
length: 16 cm;
weight: 85 g.
Fruit size:
Average size of the fetal head
Biparietal size (mm) – 35
Skull perimeter (mm) – 102
Skull area (mm2) – 860
Height and weight by ultrasound
Height (cm) - 16,4
Weight (g) - 118
Thigh length (mm) - 22
chest diameter(mm)– 34
17th week
fruit weight:
The length from the crown to the sacrum is 15-17 cm.
Weight - about 142 g.
Fruit size:
Average size of the fetal head
Biparietal size (mm) – 39
Skull perimeter (mm) – 120
Skull area (mm2) – 1080
Height and weight by ultrasound
Height (cm) - 18
Weight (g) - 160
Thigh length (mm) - 24
chest diameter(mm)– 38
18th week
fruit weight:
The length from the crown to the sacrum is 20.5 cm.
Weight - about 198-200 g.
Fruit size:
Average size of the fetal head
Biparietal size (mm) – 42
Skull perimeter (mm) – 126
Skull area (mm2) – 1320
Height and weight by ultrasound
Height (cm) - 20,3
Weight (g) - 217
Thigh length (mm) - 28
Chest diameter (mm)– 41
19th week
fruit weight:
The length from the crown to the sacrum is 20-22 cm.
Weight - about 227-230 g.
Fruit size:
Average size of the fetal head
Biparietal size (mm) – 44
Skull perimeter (mm) – 138
Skull area (mm2) – 1450
Height and weight by ultrasound
Height (cm) - 22,1
Weight (g) - 270
Thigh length (mm) - 31
chest diameter(mm)– 44
20th week
fruit weight:
Weight - about 283-285 g.
Fruit size:
Average size of the fetal head
Biparietal size (mm) – 47
Skull perimeter (mm) – 144
Skull area (mm2) – 1730
Height and weight by ultrasound
Height (cm) - 24,1
Weight (g) - 345
Thigh length (mm) - 34
chest diameter(mm)– 48
21st week
fruit weight:
The length from the crown to the sacrum is about 25 cm.
Weight - about 360-370 g.
Fruit size:
Average size of the fetal head
Biparietal size (mm) – 51
Skull perimeter (mm) – 151
Skull area (mm2) – 1875
Height and weight by ultrasound
Height (cm) - 25,9
Weight (g) - 416
Thigh length (mm) - 37
chest diameter(mm)– 50
22nd week
fruit weight:
The length from the crown to the sacrum is about 27-27.5 cm.
Weight - about 420-425 g.
Fruit size:
Average size of the fetal head
Biparietal size (mm) – 54
Skull perimeter (mm) – 162
Skull area (mm2) – 2190
Height and weight by ultrasound
Height (cm) - 27,8
Weight (g) - 506
Thigh length (mm) - 40
chest diameter(mm)– 53
23rd week
fruit weight:
The length from the crown to the sacrum is about 30 cm.
Weight - about 500-510 g.
Fruit size:
Average size of the fetal head
Biparietal size (mm) – 58
Skull perimeter (mm) – 173
Skull area (mm2) – 2520
Height and weight by ultrasound
Height (cm) - 29,7
Weight (g) - 607
Thigh length (mm) - 43
chest diameter(mm)– 56
24th week
fruit weight:
The length from the crown to the sacrum is about 29-30 cm.
Weight - about 590 - 595 g
Fruit size:
Average size of the fetal head
Biparietal size (mm) – 61
Skull perimeter (mm) – 183
Skull area (mm2) – 2710
Height and weight by ultrasound
Height (cm) - 31,2
Weight (g) - 733
Thigh length (mm) - 46
Chest diameter (mm)– 59
25th week
fruit weight:
The length from the crown to the sacrum is about 31 cm.
Weight - about 700-709 g.
Fruit size:
Average size of the fetal head
Biparietal size (mm) – 64
Skull perimeter (mm) – 194
Skull area (mm2) – 3072
Height and weight by ultrasound
Height (cm) - 32,4
Weight (g) - 844
Thigh length (mm) - 48
chest diameter(mm)– 62
26th week
fruit weight:
The length from the crown to the sacrum is about 32.5-33 cm.
Weight - about 794 - 800 g.
Fruit size:
Average size of the fetal head
Biparietal size (mm) – 67
Skull perimeter (mm) – 199
Skull area (mm2) – 3260
Height and weight by ultrasound
Height (cm) - 33,9
Weight (g) - 969
Thigh length (mm) - 51
chest diameter(mm)– 64
27th week
fruit weight:
The length from the crown to the sacrum is about 34 cm.
Weight - approximately 900 g.
Fruit size:
Average size of the fetal head
Biparietal size (mm) – 69
Skull perimeter (mm) – 215
Skull area (mm2) – 3675
Height and weight by ultrasound
Height (cm) - 35,5
Weight (g) - 1135
Thigh length (mm) - 53
chest diameter(mm)– 69
28th week
fruit weight:
The length from the crown to the sacrum is about 35 cm.
Weight - approximately 1000 g.
Fruit size:
Average size of the fetal head
Biparietal size (mm) – 72
Skull perimeter (mm) – 218
Skull area (mm2) – 3880
Height and weight by ultrasound
Height (cm) - 37,2
Weight (g) - 1319
Thigh length (mm) - 55
chest diameter(mm)– 73
29th week
fruit weight:
The length from the crown to the sacrum is about 36-37 cm.
Weight - approximately 1150-1160 g.
Fruit size:
Average size of the fetal head
Biparietal size (mm) – 75
Skull perimeter (mm) – 225
Skull area (mm2) – 4107
Height and weight by ultrasound
Height (cm) - 38,6
Weight (g) - 1482
Thigh length (mm) - 57
chest diameter(mm)– 76
30th week
fruit weight:
The length from the crown to the sacrum is about 37.5 cm.
Weight - approximately 1360 - 1400 g.
Fruit size:
Average size of the fetal head
Biparietal size (mm) – 78
Skull perimeter (mm) – 234
Skull area (mm2) – 4563
Height and weight by ultrasound
Height (cm) - 39,9
Weight (g) - 1636
Thigh length (mm) - 59
chest diameter(mm)– 79
31st week
fruit weight:
The length from the crown to the sacrum is about 38-39 cm.
Weight - approximately 1500 g.
Fruit size:
Average size of the fetal head
Biparietal size (mm) – 80
Skull perimeter (mm) – 240
Skull area (mm2) – 4810
Height and weight by ultrasound
Height (cm) - 41,1
Weight (g) - 1779
Thigh length (mm) - 61
chest diameter(mm)– 81
32nd week
fruit weight:
The length from the crown to the sacrum is about 40 cm.
Weight - approximately 1700 g.
Fruit size:
Average size of the fetal head
Biparietal size (mm) – 82
Skull perimeter (mm) – 246
Skull area (mm2) – 5040
Height and weight by ultrasound
Height (cm) - 42,3
Weight (g) - 1930
Thigh length (mm) - 63
chest diameter(mm)– 83
33rd week
fruit weight:
Weight - approximately 1800 g.
Fruit size:
Average size of the fetal head
Biparietal size (mm) – 84
Skull perimeter (mm) – 255
Skull area (mm2) – 5290
Height and weight by ultrasound
Height (cm) - 43,6
Weight (g) - 2088
Thigh length (mm) - 65
chest diameter(mm)– 85
34th week
fruit weight:
The length from the crown to the sacrum is about 42 cm.
Weight - approximately 2000 g.
Fruit size:
Average size of the fetal head
Biparietal size (mm) – 86
Skull perimeter (mm) – 264
Skull area (mm2) – 5547
Height and weight by ultrasound
Height (cm) - 44,5
Weight (g) - 2248
Thigh length (mm) - 66
chest diameter(mm)– 88
35th week
fruit weight:
The length from the crown to the sacrum is about 45 cm.
Weight - approximately 2215 - 2220 g.
Fruit size:
Average size of the fetal head
Biparietal size (mm) – 88
Skull perimeter (mm) – 270
Skull area (mm2) – 5810
Height and weight by ultrasound
Height (cm) - 45,4
Weight (g) - 2414
Thigh length (mm) - 67
chest diameter(mm)– 91
36th week
fruit weight:
The length from the crown to the sacrum is about 45-46 cm.
Weight - approximately 2300 g.
Fruit size:
Average size of the fetal head
Biparietal size (mm) – 90
Skull perimeter (mm) – 272
Skull area (mm2) – 6075
Height and weight by ultrasound
Height (cm) - 46,6
Weight (g) - 2612
Thigh length (mm) - 69
chest diameter(mm)– 94
37th week
fruit weight:
The length from the crown to the sacrum is about 48 cm.
Weight - approximately 2800 g.
Fruit size:
Average size of the fetal head
Biparietal size (mm) – 91
Skull perimeter (mm) – 276
Skull area (mm2) – 6348
Height and weight by ultrasound
Height (cm) - 47,9
Weight (g) - 2820
Thigh length (mm) - 71
chest diameter(mm)– 97
38th week
fruit weight:
Weight - approximately 2900 g.
Fruit size:
Average size of the fetal head
Biparietal size (mm) – 92
Skull perimeter (mm) – 282
Skull area (mm2) – 6620
Height and weight by ultrasound
Height (cm) - 47,9
Weight (g) - 2820
Thigh length (mm) - 71
chest diameter(mm)– 97
39th week
fruit weight:
The length from the crown to the sacrum is about 50 cm.
Weight - approximately 3000 g.
Fruit size:
Average size of the fetal head
Biparietal size (mm) – 94
Skull perimeter (mm) – 285
Skull area (mm2) – 6684
Height and weight by ultrasound
Height (cm) - 49
Weight (g) - 2992
Thigh length (mm) - 73
chest diameter(mm)– 99
40th week
fruit weight:
The usual length of a newborn is 48-51cm, and average weight 3000-3100 grams.
Fruit size:
Average size of the fetal head
Biparietal size (mm) – 95
Skull perimeter (mm) – 290
Skull area (mm2) – 6768
Height and weight by ultrasound
Height (cm) - 50,2
Weight (g) - 3170
Thigh length (mm) - 75
chest diameter(mm)– 101
The weight of the fetus by weeks of pregnancy is a very important diagnostic indicator, which is assessed using ultrasound. Lack or excess weight indicates the development of the pathological process.
Normal intrauterine development is determined by many indicators. One of these parameters is the weight of the child. The weight of the fetus by weeks of pregnancy with deviations up or down indicates malnutrition or the formation of hypoxia.
What determines the weight of the fetus during pregnancy?
The weight of the child depends on the functioning of the placenta and incoming nutrients with oxygen. Starting from the second trimester, the fetus increases to 80 grams. In the later stages, the seven-day set reaches 200 grams, but before labor, the pace slows down significantly, due to the death of the placenta.The indicator also depends on the following factors:
- unbalanced nutrition of the mother;
- stressful situations during the gestation period;
- chronic diseases;
- toxicosis;
- smoking and alcohol abuse;
- genetic predisposition.
The norm of fetal weight by week of pregnancy
In the first seven days after conception, the fertilized egg begins to divide, forming the placenta and fetus. Up to 7 weeks, all vital organs are laid and formed. The outlines of a person appear - legs, arms, head, heart muscle. Already at the 5th week, you can measure the baby.From the second trimester, intensive growth of the baby begins. The rate of increase is about 80 g / week. Further, the weight of the fetus grows even more rapidly, reaching up to 300 g / week. The uterus for a 9-month period of intrauterine development increases by 500 times.
Doctors, when evaluating parameters on ultrasound, are guided by general indicators sizes and circumferences. The main component is the positive dynamics of the intrauterine formation of the baby and its full development.
The approximate weight of a child at 30 weeks is up to 1.4 kg. Any slight deviation can be perceived as a pathology or a normal condition, depending on the individual parameters of the expectant mother and the baby itself. By the beginning of labor, the baby reaches at least 3 kg 100 gr.
Fetal weight table by week of pregnancy
The estimated weight of the fetus in the early stages is calculated using ultrasound. At a later stage, the doctor, thanks to measurements of the circumference of the abdomen and the height of the uterus, can calculate this indicator.Calculated norms of the weight of the child by weeks of pregnancy are presented in the table:
| weeks | long,cm | Weight, gr |
| 11 week | 4,1 | 7 |
| 12 week | 5,4 | 14 |
| 13 week | 7,4 | 23 |
| 14 week | 8,7 | 43 |
| 15 week | 10,1 | 70 |
| 16 week | 11,5 | 100 |
| 17 week | 13 | 140 |
| 18 week | 14,2 | 190 |
| 19 week | 15,3 | 240 |
| 20 week | 25,8 | 300 |
| 21 weeks | 26,7 | 360 |
| 22 week | 27,8 | 430 |
| 23 week | 28,9 | 500 |
| 24 week | 30 | 600 |
| 25 week | 34,6 | 670 |
| 26 week | 35,6 | 760 |
| 27 week | 36,6 | 875 |
| 28 week | 37,6 | 1000 |
| 29 week | 38,6 | 1150 |
| 30 week | 39,9 | 1320 |
| 31 weeks | 41,1 | 1500 |
| 32 week | 42,4 | 1700 |
| 33 week | 43,8 | 1900 |
| 34 week | 45 | 2150 |
| 35 week | 46,2 | 2380 |
| 36 week | 47,4 | 2500 |
| 37 week | 48,6 | 2800 |
| 38 week | 49,8 | 3000 |
| 39 week | 50,7 | 3300 |
| 40 week | 51,2 | 3400 |
Calculate the weight of the baby during pregnancy by week - calculator
The most informative method in order to make a calculation during pregnancy is an ultrasound examination. The specialist measures the length of the thigh, the size and circumference of the head, as well as the diameter of the chest. After that, it receives a ratio that is checked against the table of norms. Upon examination, the doctor is able to calculate the baby's body weight using a special formula that takes into account the height of the fundus of the uterus, the circumference of the abdomen and the thickness of the woman's bones. The method is applied in the third trimester. In case of significant deviations, a certain diet and drug therapy are prescribed.
For the full development of the baby, both an overabundance and low rates are equally dangerous. It is worth adhering to reasonable dietary norms and not neglecting walks in the fresh air, and the baby's weight and height calculator during pregnancy will help you calculate the allowable limits.