There are many causes of black stools in babies, which can be caused by diet, bowel problems, gastrointestinal disorders, and many others. Clinically, black stools need to be ruled out first. Common causes of black stool: (1) digestive tract diseases: the most common causes of blood in the stool, including esophageal varices, esophageal foreign bodies, ulcer disease, acute gastritis, gastric mucosal prolapse, intussusception, hemorrhagic necrotizing small bowel inflammation, strangulated intestinal obstruction, Meckel’s diverticulum, intestinal polyps, anal fissure, etc. (2) Blood diseases: neonatal hemorrhage, hemophilia, leukemia, aplastic anemia, thrombocytopenia and allergic purpura, etc. (3) Other systemic infectious diseases: such as sepsis, typhoid fever, etc. (4) The effect of food or drugs: certain foods and drugs can also cause changes in stool color, sometimes easily confused with blood in the stool. (5) The stool is stored in the intestine for a long time and the stool is dry. If the black stool has the appearance of black paste, less fecal odor but blood odor, oily shiny surface (asphalt) similar in shape to the stool, it can very well be blood in the stool. If black stools occur frequently, it is also necessary to do a stool routine for your baby to check for occult blood.