Common causes of red blood in baby’s stool include: dietary influences, anal fissure and gastroenteritis. 1. Dietary influences: baby diet of chili, beets, dragon fruit, etc., may make the red residue in the stool, this time is not blood in the stool, not accompanied by abdominal pain, diarrhea, bloating and other discomforts, the spirit, diet, sleep is normal, dietary avoidance of such foods can be restored to normal, without special intervention. 2. Anal fissure: children’s anal fissure is often caused by constipation, difficult defecation, accompanied by dry stool, defecation crying, pain, often a small amount of fresh blood on the surface of the stool. 3. Gastroenteritis: due to bacterial, viral and other infections of the gastrointestinal tract, occurring in acute and severe, abdominal pain, abdominal distension, diarrhea, blood in the stool, fever and so on. Baby stool a little red blood may also have other causes, it is recommended to go to the hospital in time to improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.