Blood in baby’s stool may be caused by anal fissure, intestinal infection and intestinal polyps. 1. Anal fissure: When babies drink too little water or consume less fiber food, it will lead to dry stools. When defecating, anal fissure occurs, which is characterized by painful defecation and a small amount of blood in the feces. 2. Intestinal infection: Intestinal infection is an infectious disease caused by pathogens infecting the intestinal tract, which can cause damage to the mucous membrane of the intestinal tract, resulting in symptoms of bleeding. Bleeding will be discharged with defecation, so if the baby suffers from intestinal infections, there may be blood in the stool. 3. Intestinal polyps: Intestinal polyps are abnormal growths of tissue protruding from the surface of the intestinal mucosa, which clinically manifest as intermittent blood in the stool or blood on the surface of the stool and other symptoms. Blood in stool caused by intestinal polyps often appears after defecation, and there is no pain. Therefore, if your baby has intestinal polyps, he or she may have blood in the stool. When your baby has blood in the stool, parents are advised to take your baby to the hospital in time to identify the cause of the problem and get treatment.