Children’s buttocks always have stool, clinical possible causes are incomplete physical development, bad defecation habits, spina bifida, anal sphincter relaxation. 1. Incomplete physical development: some children’s physical development is not yet complete, the anal sphincter development is immature and the anal sphincter coordination is not good, so there may be a stool from time to time discharged, this situation can be improved when the child’s physical development is gradually developed and perfected. 2. Bad defecation habits: Some children have the bad habit of holding back their stools, so when they can’t hold back, a small amount of stool will be discharged. In this case, parents are advised to guide their children to develop the habit of having regular bowel movements every day. 3. Spina bifida: This condition refers to congenital vertebral canal closure insufficiency, resulting in spinal fissure, which is related to embryonic cartilage development disorders, and the clinical manifestations include local skin disorders, sensory-motor dysfunction of the lower limbs, and dysfunction of urinary and defecatory functions. 4. anal sphincter relaxation: the situation refers to the anal sphincter muscle dysfunction caused by incomplete anal incontinence, which is associated with anorectal prolapse, internal hemorrhoids and other diseases, clinical manifestations of incomplete bowel movement, anus falling and so on. Children’s buttocks always have stool, there may be other reasons, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.