Normal baby’s stool should be yellow soft stool, and there are many causes of bleeding in the baby’s stool, which can affect the baby’s health if left untreated. The cause can be understood by the bleeding. If the blood is on the outside of the stool and is bright red in color, consider making the baby constipated and bleeding from the mucous membrane around the anus. If the blood is inside the stool, it may be a disease of the small intestine, rectum or colon. If the baby’s mother’s nipple breaks and bleeds and the baby swallows the mother’s nipple, blood in the stool can also occur. Infections can also cause blood in the baby’s stool, such as enteritis, and can usually be helped by routine stool and stool culture tests to clarify the cause. Allergies are another common cause of blood in the stool, such as milk protein allergy, the baby can generally have no other discomfort except for blood in the stool, if formula feeding can be replaced with hydrolyzed protein formula, if breastfeeding can be temporarily avoided by the mother milk, the baby will not have blood in the stool after dietary adjustment indicates that it is a milk protein allergy. If your baby has blood in the stool due to blood disorders, you can check the blood count and blood clotting function. If there are any problems with the development of the intestinal tract, you can do an ultrasound of the abdomen to see. In short, bleeding in the stool is an abnormal situation and should be treated in a targeted manner.