In general, the pregnant woman’s belly will slowly get bigger after 3 months of pregnancy. However, there is some variation in the exact timing, which is related to the pregnant woman’s body shape and pelvic size. In the first 3 months of pregnancy, the uterus expands in the pelvic cavity, and there is no significant change in the pregnant woman’s body shape at this time. In the third month of pregnancy, the uterus is just out of the pelvic cavity, at this time the uterus is about the size of a fist, after that the uterus gradually increases, from the appearance of the pregnant woman’s stomach can be seen gradually increased. However, because of the difference of pregnant women’s body shape and pelvic size, the time and degree of belly enlargement after pregnancy also varies to some extent. For women with smaller body size or larger pelvis, the belly may become bigger later, and some pregnant women can only see their belly getting bigger after 5 months of pregnancy. Therefore, pregnant women do not need to be overly concerned about the growing belly, but should ensure that they eat regularly and work and rest normally after pregnancy, while keeping a happy mood and having regular maternity checks.