Most of the postpartum small belly is a normal physiological phenomenon, often related to the loose abdominal skin of pregnant women, abdominal fat, etc., but we can not rule out certain pathological factors, such as indigestion, ovarian cysts and so on. 1. Physiological phenomenon: during pregnancy, the uterus will increase in size due to the growth and development of the fetus, but it can’t return to its normal state within a short period of time after delivery, therefore, there can be an increase in the size and expansion of the lower abdomen. In addition, some women, after giving birth, especially during menstruation, have less exercise, more nutrition and slower metabolism, resulting in the accumulation of fat, which may also appear as a large stomach. 2. Pathological factors: (1) Indigestion: after giving birth, if women often consume too much greasy diet or indigestible food during the period of sitting on the moon, it may induce indigestion, which may lead to the symptoms of abdominal distension, which is manifested as a small puffy stomach, and may also be accompanied by belching (burping), fullness and bloating after meals, anorexia, nausea, and regurgitation, and so on. (2) Ovarian cysts: A big belly after childbirth may be due to the presence of ovarian cysts and other diseases in women themselves. Ovarian cysts are prevalent in women of childbearing age, and some patients with large cysts may experience discomfort and swelling in the lower abdomen, which can lead to a gradual enlargement of the abdomen as the size of the cysts continues to increase. If you have a small stomach after giving birth, exclude physiological factors, or are accompanied by other uncomfortable symptoms, you should consult a doctor in time to clarify the cause of the disease, and if necessary, carry out the appropriate treatment.