1. Reasons why the belly gets bigger during pregnancy. It is normal for the belly to get bigger during pregnancy. This is because during pregnancy, the fetus will continue to grow and develop, taking up more and more space, and gradually compressing the mother’s internal organs. and abdominal wall. In addition, hormone levels in pregnant women will also change, leading to muscle relaxation, water retention, etc., which will also make the belly look more bulging. two,