If a nine-month-old baby has indigestion, it can be treated in three ways: first, treatment of diseases that cause indigestion, many diseases can cause indigestion, you can go to the hospital to check whether there is fructose intolerance or lactose intolerance and other common diseases that cause indigestion . If it is lactose or fructose intolerance, you need to reduce the intake of lactose or fructose, and also need to supplement lactase and other treatment. Second, the treatment of dyspepsia diarrhea symptoms, you can take montelukast to protect the intestinal mucosa, take probiotics to regulate intestinal flora, nine months of the baby prohibited the use of strong anti-diarrheal drugs. Third, treatment of malnutrition caused by indigestion, oral vitamin and mineral supplements to correct the existing nutritional deficiencies, because nine months of indigestion baby needs more nutrients than the normal amount needed.