4 months baby diarrhea may be related to the mother’s improper diet, indigestion, etc., can be treated by adjusting the mother’s diet and using probiotics to regulate the intestinal tract. 1. mother’s diet: breastfeeding baby if the mother’s diet is greasy, eat spicy and stimulating food, may affect the baby, diarrhea, can adjust the mother’s diet, avoid eating greasy, spicy and stimulating food, eat light and easy to digest food, may be able to alleviate the symptoms of diarrhea. 2. indigestion: 4 months baby gastrointestinal function is relatively weak, intestinal flora has not been fully established, prone to indigestion and diarrhea, you can use probiotics for babies such as bacillus subtilis dictyostelium granules to regulate the intestinal flora, can help to alleviate the symptoms. It is recommended that 4-month-old babies with diarrhea can go to the hospital for a checkup, under the guidance of the doctor’s treatment. The above drugs should be used in accordance with medical advice.