Usually, the belly will bulge around the fourth month of pregnancy. But the specific time to show pregnant women also related to their own situation, usually as follows: 1, genetic factors: within the normal range, the more obese pregnant women may show pregnant time earlier, the smaller pregnant women relatively later; 2, the number of fetuses: multiple pregnancies show pregnant time relatively a little earlier, singleton relatively show pregnant later; 3, the placenta position: the placenta will be in the front wall of the uterus or the back wall of the uterus, which is normal, if the placenta is in the front wall of the uterus will be more likely to show pregnant; 4, pregnancy reaction: pregnancy reaction is light, the better absorption of nutrients will be more likely to show pregnant. If the placenta is in the front wall of the uterus, it will be easier to show pregnancy; 4, pregnancy reaction: pregnancy reaction is lighter, better absorption of nutrition during pregnancy will show pregnancy a little earlier, if the pregnant woman has heavy pregnancy vomiting and loss of appetite, it may lead to poor nutrition of the fetus, thus showing pregnancy later. In addition, the amount of amniotic fluid, daily eating habits and other factors may affect the time of conception. During pregnancy, you should pay attention to your diet and strengthen nutrition. It is recommended to eat more vegetables and fruits and to take a reasonable amount of vitamins. You can also eat more high-protein foods, such as fish, shrimp, lean meat and so on. Do not be partial to food, anorexia, etc., so as not to cause malnutrition in pregnant women, affecting the development of the baby. Exercise in moderation during pregnancy and follow the doctor’s instructions for regular maternity checkups to determine the baby’s growth and development through the examination results.