A four-month-old baby’s sticky poop may be related to physiological factors, or it may be caused by lactose intolerance, digestive tract infections and other reasons. 1. Physiological factors: if breastfeeding, the mother’s diet structure is unreasonable, a large number of greasy, not easily digestible food, may lead to four-month-old baby poop sticky, usually not accompanied by other discomfort, no need for special treatment. 2. Lactose intolerance: four-month-old babies due to the lack of lactase enzyme in the body, the lactose in the food can not be digested, absorbed, may cause sticky poop, may also be accompanied by abdominal distension, diarrhea and other symptoms. 3. Digestive tract infection: mostly considered to be due to the intestinal tract is bacteria, viruses and other pathogenic bacteria caused by infection, in the stimulation of pathogenic bacteria, may cause four-month-old baby poop viscous, may also be accompanied by abdominal distension and discomfort and other symptoms. The baby’s four-month sticky poop, may also be caused by other reasons, if accompanied by other discomforts, it is recommended to consult a doctor as soon as possible, to give targeted treatment.