Four-month-old baby diarrhea may be due to improper diet, abdominal cold and other physiological factors, or may be due to indigestion, acute enteritis and other diseases, general measures can be taken, medication, can improve the symptoms of disease. 1. Physiological factors: due to the baby’s gastrointestinal function is not yet perfect, the abdomen is cold, may cause diarrhea. Such cases, need to reasonable diet, pay attention to the warmth of the abdomen, can relieve the symptoms. 2. Indigestion: four months baby diarrhea may be caused by indigestion. Need to take oral probiotics under the guidance of the doctor, such as bacillus subtilis bacillus granules to regulate. 3. Acute enteritis: intestinal bacterial infection, viral infection can cause acute enteritis resulting in four months baby diarrhea, such as bacterial infection can be based on the drug allergy oral antibacterial drugs such as cefixime. If the viral infection may not be special medication. At the same time, oral bacillus subtilis bacillus granules to regulate. The diarrhea is serious, can be taken orally montelukast to stop the diarrhea. It is recommended that the four-month-old baby diarrhea timely medical care, identify the cause of the disease, with the doctor to take relevant treatment measures. The above medications should be used in accordance with the doctor’s instructions.