Fetal weight is measured, first of all, mainly based on the results of ultrasound and the value of uterine height and abdominal circumference, using a formula to calculate the weight of the fetus in the abdomen. The more commonly used formula for uterine height and abdominal circumference is uterine height multiplied by abdominal circumference plus 200, and the value measured by ultrasound is most commonly based on the head circumference, abdominal circumference, and femur length from the ultrasound. All of the above are methods of estimating fetal weight, there is not an accurate value, ultrasound measurement is relatively accurate than the measurement of uterine height and abdominal circumference. After pregnancy, you need to control your diet, not the bigger the fetus in your belly, the better. It is better to control the weight gain during pregnancy within 25 pounds, so as to avoid the occurrence of huge baby which may lead to difficulties in labor and delivery.