Monthly babies always pull yellow water may be acute enteritis, lactose intolerance, or protein allergy and other diseases caused by special formula, medication and so on. 1. Acute viral enteritis: when the baby in the month with acute enteritis, there will be diarrhea, watery, often accompanied by overflow, bloating, crying, etc., you can use montelukast to protect the gastrointestinal tract, and probiotics at the same time to regulate. 2. Lactose intolerance: Lactose intolerance in infants is an important cause of diarrhea, with watery, foamy stools and an obvious sour odor. This is the need to use lactase. 3. Protein allergy: If an infant is allergic to proteins, he or she will also have symptoms of yellowish watery stools in the early stages, and mucous bloody stools in the later stages. Protein allergy children need to use deeply hydrolyzed milk powder or amino acid milk powder treatment. There may be other reasons why the baby always has yellow water in the month, so we suggest that you go to the hospital in time, improve the examination to clarify the cause of the disease, and then give targeted treatment. All of the above medications should be used under the guidance of a doctor.