Baby diarrhea is considered to be caused by lactose intolerance, rotavirus infection, acute enteritis, etc., can be prescribed by the doctor to take general treatment, medication and other ways of treatment. 1. Lactose intolerance: most common in breastfed babies, the baby lacks the ability to synthesize lactase enzyme in the small intestine, the baby will have bloating and diarrhea after drinking milk, in addition, the child may cry due to abdominal pain, can be temporarily fed with lactose-free milk powder, and when the condition is stabilized, the lactase enzyme can be used to carry out the treatment. 2. Rotavirus infection: This disease is highly contagious, when the baby eats or comes into contact with items with the virus, it can cause rotavirus infection, resulting in diarrhea, abdominal pain and other phenomena. Dehydration symptoms, oral rehydration salts or intravenous rehydration, and follow the doctor’s instructions to use montelukast to stop diarrhea, bacillus subtilis bacillus to regulate intestinal flora. 3. Acute enteritis: mostly due to bacterial, viral and other pathogenic microbial infections, the child will appear nausea, abdominal pain, fever and other phenomena, and stools are watery, accompanied by a bad smell. Children can use montelukast to protect the intestinal mucosa. If the diarrhea is caused by bacterial infection, it can be treated with e.g. cefaclor and cefixime. In addition, there are many other causes of diarrhea in babies, it is recommended to consult a doctor in time to clarify the cause of the disease and receive treatment as soon as possible. The above medications should be used in accordance with medical advice.