A five-year-old baby does not know how to poop, indicating the existence of fecal incontinence, may be mental psychological factors, digestive diseases, congenital developmental abnormalities and other factors. 1. mental psychological factors: five-year-old baby suffered excessive shock or there is a serious mental trauma, there will be incontinence, parents should be timely to calm the child, more communication with the child, so that the child to change his mind. 2. Digestive tract diseases: such as dysentery, acute gastroenteritis and other lesions, when the lesions are serious, it will lead to five-year-old baby fecal incontinence, may also be accompanied by abdominal pain, diarrhea and other symptoms. 3. Neurological insufficiency: when the child’s neurological insufficiency, due to the defecation, the anal muscles controlling the discharge of stool can not be timely contraction, there will be fecal incontinence. Parents should take their children to the doctor for examination and treatment if their five-year-old baby doesn’t know how to poop.