Causes of enlarged belly in early pregnancy: Enlarged belly in early pregnancy is a common phenomenon among women during pregnancy. The belly gets bigger because after pregnancy, the mother\’s body begins to gradually provide nutrients to the fetus, and this biochemical reaction will cause some changes. The following will introduce the causes of belly enlargement and how to deal with it from four aspects. Hormonal changes are the main reason. Hormonal changes in the body after pregnancy are the main cause of belly enlargement.