The results of the ultrasound sheet usually do not show the exact weight of the fetus, but the doctor can roughly estimate the weight of the fetus through the various data of the fetus in the ultrasound results. There are many ways to estimate the fetal weight, among which the common formula is: Estimated fetal weight = 1.07*BDP*BDP*BDP+0.3*AC*AC*FL, or fetal weight = 900*BPD-5200, where BDP is the fetal biparietal diameter, AC is the fetal abdominal circumference, and FL is the fetal femur length. The ultrasound results will show the measurements of the fetus and different parts of the mother’s body, including femur length, humerus length, biparietal diameter, head circumference, chest circumference, abdominal circumference and maternal subcutaneous fat of the abdominal wall and obesity level. Prediction of fetal development. The doctor will advise the pregnant woman on the precautions to be taken during pregnancy based on the weight of the fetus. Pregnant women should take care to ensure adequate nutrition, eat a reasonable diet, and eat smaller and more frequent meals. Avoid overeating, eat less food with high oil and fat, and control the weight so that the fetus will not be malnourished or cause a huge baby, which may cause difficulties in delivery.