Postpartum belly is very big, most of them are a normal physiological phenomenon: 1, the lower abdomen increases and bulges after childbirth, is due to the process of fetal development during pregnancy, the uterus will be propped up, although the fetus is delivered after the uterus has shrunk, but a short time can not return to the normal state. The enlarged uterus is still protruding in the lower abdomen, thus making the lower abdomen bigger and bulging; 2. The whole abdomen increases after delivery because the uterus enlarges during pregnancy, propping up the muscles and other soft tissues of the abdominal wall and making the abdominal wall loose. Coupled with excessive dietary intake during pregnancy, excessive deposition of subcutaneous fat, thus leading to the manifestation of abdominal enlargement, which can gradually return to normal at about 42 days after delivery. The flaccid abdominal muscles and the increased subcutaneous fat will only return to their prenatal state about six months after delivery.