Anterior and posterior pregnancy are generally referred to as pre-pregnancy and post-pregnancy, the difference between the two is the different position of the fetus in the uterus as well as the different size of the pregnant woman’s stomach. ⒈ pregnancy anterior pregnancy: pregnancy anterior position is the position of the uterus in the pelvis is closer to the front of the body, that is, the fetus is close to the front of the uterus. And with the growth and development of the fetus, the fetus will protrude into the front of the pelvis, and the pregnant woman’s stomach will appear larger. Pecuniary pregnancy posterior position: pregnancy posterior position is the position of the uterus in the pelvis is relatively backward, the position of the fetus in the uterus compared to the front of the pregnancy is more backward, the pregnant woman’s stomach will be relatively smaller than the front of the pregnancy. Because the uterus is more backward, pregnant women in the posterior position are also more likely to compress the lumbar vertebrae and are prone to lumbar pain and other conditions. If the pre-pregnancy and post-pregnancy are not close to the endocervical opening, they are generally normal phenomena and will not have an impact, but pregnant women should go to the hospital for regular checkups.