In infants with blood in the stool, it has the following causes: i. Bacterial enteritis, the child can have fever, vomiting, blood in the stool and mucus-like material, which can improve the stool routine and stool culture test. If the results are positive, antibiotics need to be applied to treat the problem, and dietary hygiene should be enhanced. ii. This kind of blood is usually attached to the surface of the stool, and most of them appear in the late stage of the child’s bowel movement, and there can also be pain and crying during defecation, which can be diagnosed by anal finger diagnosis; third, there can be systemic diseases, such as hematologic diseases, and children with coagulation dysfunction can have blood in the stool; there can also be jam-like blood in the stool with intestinal overlap, and this situation needs to be diagnosed by perfecting peribulbar ultrasound. Therefore, when a child has blood in the stool, the nature and location of the blood should be analyzed and then treated for the cause.