How to Calculate the Weight of a Fetus?

Update Date: 2024-07-02 Source: Network

During B-ultrasound, the fetus's abdominal circumference, biparietal diameter and other values are measured to calculate the fetus's weight, such as the pregnant woman's uterine height multiplied by abdominal circumference plus 200 equals the fetus's weight. Due to the influence of various factors such as the nutritional status and physical fitness of each pregnant woman, there will be some differences in the fetus's weight, and the postpartum weight is still the main concern. If the fetus's weight is too light, it is recommended to increase nutrition.

1. Two simple methods to calculate the fetus's weight:

(1) When the fetus first exposes part of the fetus (the fetal head or fetal buttocks) and has not yet entered the pelvis, the following formula can be used: Fetal weight (grams) = uterine height (cm) - 12 × 155.

(2) When the first part of the fetus enters the pelvis, use the following formula: Fetal weight (grams) = uterine height (cm) - 11 × 155.

2. Reasons for the weight of the fetus:

Generally speaking, a fetus's weight within two weeks of being too small or too large is considered normal. However, if it exceeds this range, doctors may suspect developmental issues in the fetus. If there are fatal developmental issues, there may be a need to terminate the pregnancy. If it is due to lack of nutrition or incorrect menstrual calculation, then corresponding recommendations will be given.

3. Methods to maintain normal fetal weight:

Normal weight gain before delivery should be between 12.5-15 kilograms, but many expectant mothers gain 5 kilograms in weight just after becoming pregnant. Reasonable and balanced nutrition is the material basis for maintaining the health of the mother and the growth and development of the fetus, but excessive intake can lead to an oversized fetus.