The majority of pregnant women in about 4 months of pregnancy will be pregnant, the specific time to show pregnancy varies from person to person, there are mainly the following situations: 1, there are some of its own obese women, in the pregnancy of 5 months or so the stomach will be more obvious, pregnancy and genetic factors have a certain relationship with the pregnant women with a thin figure will be later. 2, pregnant women and the size of the growth of the fetus is also related to the size of the fetus if the fetus develops faster, the pregnant woman 3, pregnant women and the amount of amniotic fluid also has a relationship, in the case of more amniotic fluid, pregnant 4 months belly is more obvious, less amniotic fluid pregnant women may be a little longer. Women in pregnancy should pay attention to the health of the diet, eat more food rich in vitamins, can promote the healthy development of the fetus, in addition to recommending that pregnant women should be regular prenatal checkups, and always observe whether the development of the fetus is normal.