How to calculate whether the baby s weight is standard

Pregnant women are very concerned about the health and appearance of the baby after pregnancy, weight, etc., so they need to carry out a variety of examinations to understand the condition of the baby.

The weight of the fetus is measured differently at different stages, and is calculated from the distance from the baby's head to the buttocks during the first trimester of pregnancy. After 4 months, the baby's head circumference or the diameter between the two parietal bones, and the length of the abdominal circumference to the thigh bone are calculated. No matter which method is used, there may be a certain error in the baby's weight, but the error value is not too large.

Especially before the baby is about to be born, the doctor will check the baby's weight. Only the baby's weight is in a normal range is possible to give birth, if the baby's weight is too large, the birth will have this certain difficulty, for such pregnant women, can only be delivered by caesarean section.

If you want to maintain it at a normal level, pregnant women must control their weight, eat less and eat more meals in the diet, not too much each time, only in this way can the fetus have a good weight and be more healthy after birth.

The formula for calculating fetal weight is only an estimate, not a representation of the weight at birth. The formula for fetal weight is uterine height 200 abdominal circumference and double parietal diameter 900-5200. But this is only the weight of the fetus and is not necessarily very accurate.

It is recommended that as long as the fetus develops normally, you should do a good pregnancy check-up, and it is recommended that you do a good pregnancy test before pregnancy and exercise appropriately.

3 months pregnant, the first prenatal checkup, pregnant mothers can estimate the baby's weight according to the data of B ultrasound.

In general, there will be a difference of plus or minus 10-15% between the actual weight at birth and the ** weight.

Fetal weight formula one.

Fetal weight (grams) = head circumference).

**Fetal weight formula two.

Fetal weight (grams) = abdominal circumference).

Fetal weight formula three.

Fetal weight (grams) = femur length).

Fetal weight formula four.

Fetal weight (grams) = thickness of subcutaneous fat in fetal legs).

To calculate the fetal weight, ultrasonography is required to determine the fetal's biparietal diameter, femur length, and abdominal circumference. The measured data is brought in according to the formula, and the weight of the fetus can be calculated. The formula for calculating fetal weight is as follows:

1. Formula 1: double parietal diameter double parietal diameter double parietal diameter + abdominal circumference abdominal circumference femur length; (BPD: double parietal diameter AC: abdominal circumference FL: femur length).

2. Formula 2: body weight (g) = 900 double top diameter (cm) - 5200

3. Formula 3: weight (g) = palace height and abdominal circumference + 200

4. Formula 4: Preset weight (EBW) = the proportion of double parietal diameter Double parietal diameter (BPD) + the proportion of abdominal circumference Abdominal circumference (AC) + the proportion of femur length Femur length (FL) + 15% error value.

5. Formula 5: weight before 20 weeks of gestation = cubic 2 (g) of gestational months, and weight after 20 weeks gestation = cubic 3 (g) of gestational months.

The formulas listed above are estimates only and do not represent the actual weight of the baby after birth. When measuring fetal head circumference, abdominal circumference, and thigh bone length, fetal posture can affect the measurement results. Therefore, there will be a certain error in the calculated fetal weight, and the actual weight after birth will have a 10%-15% error with the ** weight.

It is only possible to speculate whether the fetus is developing normally based on the estimates, and whether it is necessary to strengthen nutrition or control the diet to prevent the fetus from becoming too large.

Fetal weight algorithms include: abdominal measurement, such as uterine height and abdominal circumference, etc., with large errors; Fetal markers can also be measured by ultrasound to estimate fetal weight; The more fetal measures are included in the general estimation formula, the more accurate the weight results. Here are three formulas for reference:

a. Fetal weight (g) = double parietal diameter (mm) - 4409;

b. Fetal weight (g) = double parietal diameter (mm) + anterior and posterior abdominal diameter of the fetus (mm) - 5183;

c. Fetal weight (g) = double parietal diameter cm) to the 3rd power + anteroposterior abdominal diameter (cm) x thoracic anteroposterior diameter (cm) x femur length (cm).

d. During the physical examination of pregnant women, the uterine height (cm) + abdominal circumference (cm) is 140cm, indicating that there may be macrosomia, which needs to be paid attention to, but this situation should be combined with the weight of the pregnant woman herself to make a final judgment.

The development of the fetus

0-4 weeks: The fertilized egg moves along the fallopian tube to the uterine cavity, enters the uterus for implantation and development, and the embryo at this time cannot be called the fetus, but can only be called the embryo.

5-8 weeks: The key organs begin to develop, the nose, eyes, and ears begin to grow, and the embryo needs a lot of nutrients.

9-12 weeks: 3 months is not called an embryo, it becomes a formal fetus, and the fetal heartbeat, brain, heart, lungs, envy arms, and legs begin to form.

13-16 weeks: The baby begins to grow fetal hair and begins to feel fetal movement.

17-20 weeks: The fetus begins to move in the belly, and the pregnant mother feels that the fetal movement is getting stronger and stronger.

21-24 weeks: The transparent ** of the fetus gradually becomes opaque, tends to be pink, and there are many wrinkles, and the face shape is clearer, looking like a newborn.

25-28 weeks: The baby's lungs begin to grow rapidly and they are about to learn to breathe.

29-32 weeks: The physical development of the fetus is basically completed, the fetus is ruddy, the subcutaneous fat is thickened, and the nervous system is more developed.

33-36 weeks: The weight of the fetus is about 2400g, the fetal hair on the face, hands and feet gradually begins to thin, the wrinkles on the face disappear, the nails also begin to grow, and swallowing begins to occur.

37-40 weeks: The head of the fetus begins to be fixed, which is usually called entering the pelvis, and the development of the lungs is becoming more and more mature, and the fetal lungs are the last mature organs of fetal development, and the fetus is about to be born.

The weight of the fetus can be calculated in conjunction with the height of the fundus.

There are many ways to measure fetal weight, some of which are quite complex, but all of them are rough estimates, so it is better to keep it simple. There are roughly two easy ways to do this:

1. The fetal presenting part, the lowest part of the fetus is clear and bright, and the fetal head or fetal buttocks have not yet entered the pelvis, the following formula can be used: fetal weight (grams) Uterine fundus height (cm) -12 l55.

2. When the fetal presentation part has entered the pelvis, the following formula is used: fetal weight (grams) Uterine fundus height (cm) -11 155.

For example, if a pregnant woman is 40 weeks gestation and the fundal height is 33 cm, the fetus weighs 3,410 grams using the second formula above, indicating that the fetus is developing well.

Causes of low birth weight fetals:

The main thing is the nutritional status of pregnant women. Generally speaking, due to physiological changes and needs, pregnant women will gradually increase their appetite as the gestational months increase. However, if the pregnant woman's diet is unreasonable, coupled with the pregnant woman's picky eating, partial eating, taboo and other reasons, it can cause insufficient food intake and make the fetal weight lower than normal.

Therefore, pregnant women should pay attention to increasing nutrition, especially to the diversification of food, in order to ensure that the fetus has good congenital development, which is an important part of eugenics.

The above content refers to People's Daily Online - tells you how to scientifically measure fetal weight.

The weight of the fetus, I think the most important thing is to send the woman's weight directly to his son at home, and then cut off the mother's weight.

How do you calculate the weight of a baby's fetus? This usually goes to the hospital, and the hospital has a special instrument for a measurement.

To calculate the weight of the fetus, it is necessary to monitor it through B-ultrasound, which is based on the length of his femur with a double parietal diameter of the fetus. There is also it according to the month.

The most important way to calculate the baby's weight is to calculate it according to the child's growth and development law, the child's weight from 1 to 6 months is equal to 3 plus the age of the month multiplied, and from 7 to 12 months, the child's weight is equal to 6 plus the age of the month multiplied.

How to calculate the weight of the fetus, if you usually go to the hospital to do it, it is when the fetal pressure test is done, he has a relevant instrument.