Usually, in the third month of pregnancy, the pregnant woman’s stomach is similar to her usual daily life. After three months, it can be seen from the abdominal appearance of the stomach becomes larger, but there is a certain variability in each person, the size of the stomach is different in the third month of pregnancy. In general, pregnant women in the third trimester of pregnancy, that is, about 12 weeks, 12 weeks pregnant uterus its position is generally in the pubic symphysis on the 3 ~ 4cm, at this time the uterus has not grown outside the pelvis, the doctor may not be able to palpate, pregnant women’s abdominal appearance is also often no obvious changes, the general public can not be seen from the pregnant woman’s abdomen to see the pregnancy. In addition, if a pregnant woman has a bulging abdomen in the first trimester of pregnancy, it may be the result of fat accumulation and not a truly enlarged uterus. After the third trimester, the uterus grows faster, the uterus grows beyond the pelvis, and the doctor can palpate the uterus above the pubic symphysis, and the pregnant woman’s abdomen can be bulging, so that the pregnant woman’s pregnancy can be seen from the outside.