The fetal abdominal circumference refers to the development of the fetal abdomen. By checking the size of the fetal abdominal circumference, pregnant women can determine whether the fetus is developing normally. The value of fetal abdominal circumference varies in different weeks of pregnancy, but it is generally within the reference value which is approximately normal. If the abdominal circumference is large, the fetus is fat; if it is small, the fetus is probably thin. If the fetal abdominal circumference is found to be large or small, it should be analyzed together with other indicators of the fetus. It is important to do routine maternity checkups and to do all kinds of teratology tests during pregnancy. Pregnant women should eat a comprehensive and diversified diet and avoid eating too many sweets and fatty foods to avoid excess nutrition, which may also indirectly cause the fetus to have a large abdominal circumference.