Pregnancy stomach changes from flat gradually gradually become bulging. After pregnancy, with the increase of pregnancy weeks, the uterus will gradually increase, generally in about 12 weeks of gestation when the uterus beyond the pelvis up to the pubic symphysis on the 2-3 transverse fingers, more than 16 weeks of gestation between the bottom of the uterus big umbilicus and shame when pregnant women’s stomach can be manifested as a slight bulge. With the increase of the uterus, the belly will become more and more obvious, until 36 weeks of pregnancy when the bottom of the uterus can reach 2 horizontal fingers below the raphe, at this time the abdomen is the most obvious bulge. After pregnancy, the breasts will gradually increase in size, including the development of breast follicles and ducts, in preparation for breastfeeding. After pregnancy, due to the laxity of joint ligaments and the influence of the enlarged uterus, the center of gravity of the body is shifted backward, and the lumbar spine protrudes forward, which often results in mild low back pain. When the pain is obvious, it is necessary to go to the hospital in time to find out the cause and treat it actively.