The normal range of fetal abdominal circumference depends on the week of gestation, from 16 weeks of gestation onwards, the average weekly growth is 0.8 cm. after 34 weeks of gestation the growth rate of abdominal circumference slows down. If the abdominal circumference measured at 16 weeks of gestation is taken as the base, the average growth value at full term is 21 cm. generally, the standard values of fetal abdominal circumference can be referred to, the average abdominal circumference at 16 weeks is 10.32 ± 1.93 cm, at 24 weeks is 18.74 ± 2.22 cm, at 36 weeks is 29.44 ± 2.83 cm and at 40 weeks is 31.49 ± 3.12 cm. If the abdominal circumference of the fetus is large, there is a risk of macrosomia, but the diagnosis is also made by measuring the shoulder diameter and the chest diameter of the fetus. If the abdominal circumference of the fetus is small, it may be malnutrition, that is, the fetus is thin and weak, this result can usually be appropriate nutritional supplements, such as calcium and high quality protein in the middle of pregnancy, such as milk, soy products, seafood, etc.