How big is the belly at 20 weeks needs to be judged according to the individual’s situation, usually the normal abdominal circumference is about 76-87 centimeters. Each person’s physical condition is different, so 20 weeks belly size is not the same, if the pregnant woman itself is relatively obese, with the development of the fetus in the course of pregnancy, 20 weeks or so may have a larger belly, but if the usual itself is relatively thin, may be pregnant 20 weeks belly is also relatively small. During pregnancy, you need to pay more attention to your personal diet, eat more light and nutritious food, promote fetal development, so as not to produce maldevelopment and so on, and also need to regularly consult a doctor for uterine height and abdominal circumference test, if there is an abnormality, you need to consult a doctor in a timely manner.