Four-month-old babies with diarrhea may be caused by physiological factors or pathological factors such as indigestion, acute and chronic gastroenteritis, etc., which need to be regulated by general treatment and oral medication. 1. Physiological factors: due to cold or supplemental food added too early. Parents are advised to give the baby a hot compress, massage the abdomen, suspend the addition of complementary foods, if necessary, follow the doctor’s advice to take bifidobacteria triple live bacterial relief, remember to strictly follow the doctor’s instructions to ensure the safety of the medication. 2. Pathological factors: (1) indigestion: as the digestive function of four-month-old babies is relatively weak, they may suffer from indigestion and show the above symptoms. It is recommended to follow the doctor’s advice to give digestive treatment, such as oral compound pepsin powder, can also be taken orally, such as bacillus subtilis bacillus granules to regulate the intestinal flora, to promote the earliest possible recovery. (2) Acute and chronic gastroenteritis: four-month-old infants suffer from bacterial or viral infection, which induces acute and chronic gastroenteritis and manifests the above symptoms. It is recommended to clarify the type of infection in time, such as bacterial infection, according to the drug sensitivity oral antibacterial drugs such as cefixime; such as viral infection, self-limiting, can not be special treatment. Severe diarrhea can be orally administered montelukast to stop diarrhea. It is recommended to strengthen the daily care of the baby, eliminate the adverse factors, pay attention to the baby to keep warm and sleep, etc., to help reduce the incidence of diarrhea symptoms. If the baby has diarrhea, it is recommended to consult a doctor. The above medications should be used in accordance with medical advice.