Level 1: Is it normal to have a big belly after five months of pregnancy? The size of the belly at five months of pregnancy varies from person to person, but generally speaking, pregnant women can already clearly feel the changes in their belly at this time. At this time, the fetus has grown to about 18 centimeters long and weighs about 300 grams. In addition, the belly will also become more prominent as it begins to expand upward. If you\’re five months pregnant and your belly looks bigger or smaller, it doesn\’t necessarily mean there\’s something wrong. Everyone\’s body shape and pregnancy are different. Level 2: How to maintain a healthy tummy? To maintain a healthy tummy, here are a few things you need to pay attention to during pregnancy: