Fetal congenital anal atresia may be caused by dysplasia, family genetic factors, and blood flow disorders during fetal life. 1. Poor development: for example, if the pregnant woman is often depressed or in a bad mood, it may cause the fetus to develop abnormally at a certain period of time, resulting in congenital anal atresia. 2. Family genetic factors: chromosomal genetic disorders may also induce congenital anal atresia, which is a relatively common cause of the disease, so it is necessary for pregnant women to be examined before pregnancy. 3. Fetal blood flow obstacle: if mesenteric blood vessel development abnormality or malformation occurs in the fetus, it will also cause blood flow obstacle in the intestinal area, leading to intestinal necrosis or lesion, and then induce congenital anal atresia. In addition, it is recommended that the patient is necessary to have an active labor and delivery examination to avoid causing congenital anal atresia.