In general, pregnant women begin to experience a slight bulge in their small abdomen from about 3 1/2 to 4 months, and the bulge becomes more pronounced as the duration of pregnancy increases. During the first 3 months of pregnancy, the uterus does not increase significantly, and in the 3rd month, the uterus is just out of the pelvis, when it is about the size of a fist. From about 4 months onwards, not only does the uterus gradually increase in size, but the amniotic fluid also increases significantly and reaches above the navel, so it is easier to observe pregnancy from the outside. At this time, it is recommended to wear maternity clothes in daily life to avoid tightening of clothes, which may affect the growth of the fetus. Of course, everything cannot be generalized, some pregnant women need to be 5 months pregnant or even more to see their abdomen grow bigger, some pregnant women have a fuller body shape and naturally their abdomen will be more obvious than that of petite pregnant women. Some pregnant women have wider pelvises and their abdomens will not be as prominent as those with narrow pelvises. In addition, some pregnant women eat too much during pregnancy and exercise too little, which can also lead to a larger abdomen than pregnant women in the same month. Pregnant women are advised not to pay too much attention to the enlargement of the abdomen, but to eat regularly, work and rest normally, have a happy mood, and have regular maternity checks.