The back and front of the womb have nothing to do with the birth of a boy or a girl, there is no specific clinical manifestation of the birth of a boy or a girl, and the sex of the fetus is determined by the sex chromosomes. In early pregnancy, the fertilized egg is deposited in the endometrium, and the site of deposit is random, part of the fertilized egg is deposited in the endometrium of the anterior wall of the uterus, and as the embryo grows and develops, it can show a pronounced anterior convexity of the abdomen, that is, anterior conception; part of the fertilized egg is deposited in the endometrium of the posterior wall of the uterus, and as the embryo continues to grow and develop, the anterior convexity of the abdomen is not obvious, showing posterior conception, which has nothing to do with the sex of the fetus. Into the middle or late pregnancy, with the continuous growth and development of the fetus, the uterus may also continue to grow, some pregnant women with anterior uterus, larger fetus, abdominal wall muscle relaxation, etc., the abdomen is obviously convex, which can be manifested as anterior pregnancy; some pregnant women with strong abdominal wall muscle strength, relatively small fetus, posterior uterus, etc., which can be manifested as posterior pregnancy, and this has nothing to do with the sex of the fetus. Pregnant women with abnormalities during pregnancy should seek medical treatment as soon as possible to avoid delaying the condition and leading to adverse consequences.