Parents need to pay attention to the state of the infant’s bowel movement and the nature of the stool, and promptly seek medical attention for blood tests, stool routine and stool occult blood tests, etc., to clarify the diagnosis and then treat the symptoms. Common causes and treatments 1, dietary factors: supplemental food added to animal offal, animal blood products. Animal blood inside the heme iron will be combined with sulfide into iron sulfide. Iron sulfide is black, and after metabolism, human feces will appear black. Generally no other symptoms, usually no special treatment; 2, gastrointestinal bleeding: often due to peptic ulcers, anal disorders and other causes. If the amount of bleeding is small and the symptoms are mild, it can be manifested as black material in the stool, which should be treated according to the cause and medical advice. Vitamin K can be supplemented in time to prevent bleeding, and omeprazole can be used to inhibit gastric acid secretion, thioglycollate gel to protect gastric mucosa, and amoxicillin for anti-infection treatment. It is recommended that infants eat as little and as often as possible, and avoid cold and raw foods, such as ice cream. For infants who have added complementary foods, they should try to choose light, easy-to-digest soft foods such as soft noodles, millet porridge, etc. Avoid deep-fried foods, which may aggravate the intestinal burden or lead to gastrointestinal disorders.