Abdominal circumference is measured from the 16th week of pregnancy by standing in the upright position and circling the abdomen horizontally for 1 week with the navel as the reference point, and the measured value is the abdominal circumference. The abdominal circumference increases 0.8 cm per week on average, and the fastest growth rate occurs between 20 and 24 weeks of pregnancy. After 34 weeks of pregnancy, the growth rate of abdominal circumference slows down. If the abdominal circumference measured at the 16th week of pregnancy is used as a base, the average growth value is 21 cm until the full term. When the circumference does not increase according to the value, it usually causes worry and confusion for pregnant women. In reality, the growth of abdominal circumference is not exactly the same for every pregnant woman. This is because the abdominal circumference varies according to the weight and thinness of each person during pregnancy, and the abdominal circumference varies according to the growth of the fetus and the uterus, and the abdominal circumference varies according to the pregnant woman herself. Some pregnant women have pregnancy reaction, eating is not very good, appetite increase or decrease, have an impact on the abdominal circumference. Some pregnant women have rapid weight gain since pregnancy, abdominal skin fat thickening faster, not only the waist circumference thickening, abdominal circumference is also faster than other people’s growth.