The abdominal circumference after pregnancy is related to the original basic abdominal circumference, the abdominal circumference at 4 months of pregnancy is about 70-89cm. but everyone’s basic height and weight is different, as well as the amount of diet and exercise during pregnancy, the size of the fetus is also different, the abdominal circumference will fluctuate up and down. 1, the initial height and weight of the pregnant woman: if the pregnant woman has a wider skeleton, or more abdominal muscle fat, a larger abdominal circumference before pregnancy, and a larger abdominal circumference after pregnancy is also normal; 2, diet and exercise during pregnancy: not only will affect the amount of muscle and fat of the pregnant woman, but also the size of the fetus, which will lead to changes in abdominal circumference. Pregnant women can check whether the increase in abdominal circumference is caused by the size of the fetus, so as to properly adjust the diet and exercise; 3, abdominal circumference measurement: with a soft ruler to the navel of pregnant women prevail, around the abdomen a week, the value on the soft ruler that pregnant women abdominal circumference. Measurement must be lying flat, keep natural breathing. It is best to do under the guidance of a doctor, measurement position or measurement position is incorrect can affect the results. The average increase in abdominal circumference after pregnancy is 0.85 cm per week, but after 20 weeks of pregnancy, the increase is less stable, so it is recommended to have regular checkups to determine your condition and the development of the fetus. The height of the uterus is a better indicator of the size of the fetus than the circumference of the abdomen.