5 months old baby diarrhea is mainly seen in diarrhea and enteritis, the treatment has different: 1, diarrhea, mainly due to the baby’s gastrointestinal tract function is not perfect, poor digestion, viral infection and intestinal flora dysbiosis caused by the stool for the egg flower soup-like stool or watery thin stool. Treatment requires rehydration, usually by giving a compound electrolyte solution orally or in light saline. Drugs should be given to protect the intestinal mucosa, such as montelukast. The main reason for this is that it is not necessary to give antiviral treatment. 2. enteritis, mainly due to unclean diet caused by bacteria, viruses and parasitic infections into the intestinal tract infection. The stool is yellow mucus stool, which may be accompanied by blood. The treatment is also to give the compound electrolyte solution rehydration treatment to prevent dehydration, give probiotics to adjust the intestinal flora. If the bacterial infection is severe and accompanied by fever, the child should be treated with appropriate antibiotics, such as cephalosporin, etc. The choice of antibiotics should be guided by the clinician.