The small abdominal circumference of the fetus is related to malnutrition or the amount of amniotic fluid, which requires timely nutritional supplementation and medical treatment. If a pregnant woman suffers from malnutrition or poor absorption of fetal nutrients during pregnancy, it will easily cause fetal growth and development to be restricted, its growth will not reach the normal standard, and the abdominal circumference will be small. At this time, pregnant women need to supplement the intake of high-quality protein, in the original diet on the basis of additional meals, nutritional balanced collocation, appropriate rest, avoid overwork. Smaller abdominal circumference is also related to factors other than nutrition, pregnant women’s amniotic fluid abnormalities or fetal chromosomal abnormalities can be caused, at this time you need to consult a doctor in a timely manner, under the diagnosis of doctors to identify the causes of the disease, and then according to the condition of the fetus to choose the right treatment. Therefore, the small abdominal circumference of the fetus needs to consult a doctor in time, identify the cause of the disease and then give targeted treatment under the guidance of the doctor.