Children who cry all the time when pooping may be caused by anal fissure, perianal dermatitis or constipation. 1. anal fissure: children if because of trauma or long-term constipation, the wrong way to use the open-ended and other reasons, may lead to anal fissure and appear to relieve the stool when the local wound caused by irritation, pain and crying. 2. Perianal dermatitis: if the child’s anus is infected with localized mucous membrane and causes perianal dermatitis, then the baby will cry because of the pain when relieving stool. 3. Constipation: children who are constipated are prone to dry stools that are not easily discharged, and the effort to relieve the stools will cause the child to cry. Parents usually must take the baby to the hospital regularly for health checkups, if the baby often poops and cries, it is recommended to take the child to the hospital as soon as possible to find out the cause.