The baby's weight has always been a concern of pregnant mothers, especially in the third trimester. It is not good for the fetus to be too light and too heavy.

The normal weight of the fetus at birth ranges from 5-8 kg, but it is only 5 kg, which feels too small. It's just a little soft to hold, with small hands and feet, which is difficult to take care of. It is best to weigh in the range of 6-7 kg. Of course, 8 kg is easy to take care of, but it is too big to be a good thing.

Because the fetus is too large, it is easy to cause maternal labor difficulties and the labor process is too long. For lying-in women, the trauma to perineum will be even greater. For the baby, because the labor process is too long, it is easy to lead to fetal hypoxia. Many times, if the fetus is too big, the doctor will recommend caesarean section. Cesarean section is more harmful to maternal health, difficult to recover and more risky. The baby born by caesarean section is not squeezed by the birth canal, and the probability of lung infection is greater than that of the baby born. The antibody given by the mother in the birth canal is not strong, and the resistance is not as strong as that of the baby who gave birth to a child.

How do expectant mothers know if the fetus is too big?

1. In fact, pregnant mothers will do B-ultrasound several times during the usual pregnancy examination. Each B-ultrasound list will show whether the fetus is too big or too small or in line with the current gestational age. Pregnant mothers can adjust their diet according to the B-ultrasound list.

Do another B-ultrasound at 36-38 weeks of pregnancy. In addition to understanding the growth and development of the fetus, amniotic fluid depth, umbilical blood flow and so on. The B-ultrasound doctor will estimate the weight of the fetus this time and make a preliminary decision on the mode of delivery. Usually pregnant mothers can calculate by themselves according to the data on the B-ultrasound list. These formulas are as follows:

BPD/ biparietal diameter, HC/ head circumference, AC/ abdominal circumference, FL/ femur length, the number is substituted in centimeters, and the calculation result is in grams. These formulas have an error of 10% to 15%.

Formula 1=BPD*900-5200

Equation 2 =1.07 * bpd * bpd * bpd+0.3 * AC * AC * fl.

Equation 3 =-4973.72+260.69hc

Equation 4 =-2686.60+171.48ac.

2. It is very simple and convenient to directly calculate by inputting the corresponding numbers on some vaccination apps.

During the 7-9 months of pregnancy, the fetus grows very fast. If the normal B-ultrasound shows that the fetus is more than two weeks old, the pregnant mother must adjust her diet and not eat seafood to prevent the fetus from being too big. Please follow the doctor's advice at any time.

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