The third trimester of pregnancy does not necessarily show, and there are individual variations. The term “visible pregnancy” refers to the phenomenon of a pregnant woman’s abdomen expanding, thus revealing her pregnancy from her appearance. In the third trimester of pregnancy, the enlarged uterus has protruded from the pelvis, the uterine fundus can be up to 2~3 transverse fingers on the pubic symphysis, for the thin pregnant women at this point in time the abdomen has been slightly rumbled, part of the pregnant women can be seen from the appearance of pregnancy, but for the obese pregnant women, at this time, more do not show pregnancy. As the weeks of pregnancy increase and the fetus grows, the uterus will also increase significantly, pregnant women’s abdominal bulging more and more obvious. The uterine height should be measured during the examination to estimate the gestation week and the size of the fetus. However, the height of the uterus is affected by the development of the fetus, the amount of amniotic fluid, single fetus and multiple fetuses, etc., and there are some differences, so it is also necessary to combine with ultrasound examination to assess the size of the fetus during pregnancy.