Baby with blood in the stool can be seen in constipation, diarrhea disease or milk protein allergy, etc., specific need to combine the baby’s specific situation to analyze and judge. 1. constipation: such babies can have dry stools, affecting defecation, defecation difficulties, often accompanied by a significant increase in the time between defecation, there can be local intestinal mucosal damage, the phenomenon of blood in the stool, through the intervention of constipation relief after the blood can be improved. 2. Diarrhea disease: such as bacterial infections caused by diarrhea disease, there may be a significant increase in the number of stools and changes in stool properties, presenting mucus blood stools, which may be accompanied by fever symptoms. 3. Milk protein allergy: this kind of baby eating protein food, can appear mucus blood stools, can be accompanied by increased stools or eczema, with the baby immune system immaturity, intestinal permeability changes and genetic factors, etc., this kind of baby can be serious poor weight gain. 4. other: such as juvenile polyps, painless chronic blood is its main symptom, anal diagnosis or colonoscopy can assist in the diagnosis. Blood in baby’s stool may also be related to other causes, it is recommended to actively consult a specialist for assessment and diagnosis.