Seven months pregnant, diagram of belly size and changes. Seven months pregnant, the baby has already developed a lot in the mother\’s womb. As the baby grows, the mother\’s body also undergoes various changes, the most obvious of which is the size and shape of the belly. This article will introduce in detail the changes in the belly of pregnant women in seven months from four aspects. 1. The size and shape of the belly. When you are seven months pregnant, your belly has already