Babies have blood in the stool for more reasons, you need to observe the color of the blood, the amount, the time of occurrence, etc. The possible causes of blood in the stool are: 1. The intestine can not tolerate a certain food, so that the small intestine mucosa is damaged, the blood enters the intestinal cavity, as this blood remains in the intestine for a period of time before it is discharged with the stool, during which it is destroyed by intestinal fluid, so the stool test can only detect the stool occult blood, and there are no red blood cells. It is common in babies with milk protein allergy. The damage to the small intestine will persist without any change in diet, resulting in growth retardation in babies. 2. Fresh blood is seen in the stool, and the blood is attached to the surface of the stool, and the test suggests the presence of red blood cells, most often due to anal fissures. The baby will be accompanied by crying and straining to defecate, but the stool is not necessarily dry. Because the baby’s anal sphincter is not mature enough, the contraction and stretching mediation is not perfect, and there are often small fissures caused by the defecation process, resulting in a small amount of fresh blood in the stool. 3, systemic diseases: such as bleeding disorders, infections, vitamin K deficiency, etc. 4, the intestinal tract itself disease: acute intussusception, intestinal obstruction, colonic polyps, ulcerative colitis, etc. Found that there is blood in the stool is best to find a professional doctor to check to determine what is the cause to take timely treatment, so as not to delay the disease.