Congenital anencephaly is caused by poor development during embryonic period, also called congenital anal atresia. Congenital anoikis is a congenital disease, it is the manifestation of congenital anorectal atresia, because the genes in the anal part of the fetus, mutated during the development process, and finally did not develop into an anus, it may be that the development is poor during the fetal period, and the fetus is weaker, or the mother’s body is inherently weaker in the pregnancy, so it leads to congenital anoikis. Congenital anus must be treated by surgery, otherwise the patient can not defecate, prone to intestinal obstruction symptoms, may also have abdominal pain, vomiting and other symptoms, can be surgically implanted artificial anus treatment, usually after surgery can be cured. It is recommended to pay attention to the diet during pregnancy, do not mess with medication smoking and drinking, etc., to do regular checkups to prevent the occurrence of congenital anus.