If children have blood on their buttocks after stool, the following reasons are mainly considered: 1. caused by children suffering from anal fissures, children’s stool is very dry, plus the child is too hard when relieving stool, often causing anal fissures, at this time there will often be blood on the buttocks of children, and the blood is very bright red, children often have violent crying and pain when relieving stool. 2. caused by children suffering from Intestinal polyps caused by children suffering from intestinal polyps will cause chronic bleeding in the intestines, which will also cause children to have blood on the buttocks after stool, you can give children a timely colonoscopy to further confirm the diagnosis.