The common causes of blood in the stool of infants are as follows: 1, intestinal infection, infant intestinal infection can be blood in the stool, that is, mixed with blood in the stool, sometimes visible to the naked eye, sometimes the stool test can indicate that the occult blood is positive, infection caused by blood in the stool is often related to bacterial infection, after antibiotic treatment can generally be alleviated. 2, milk protein allergy, whether breastfeeding or formula feeding, are This protein allergy may occur. The main reason for this is that the amount of blood in the stool of infants with protein allergy is relatively small, but it lasts for a long time. This is rare, but it is important to make a good differential diagnosis.