9 months baby diarrhea no quick solution, may be indigestion, food protein allergies, etc., according to the cause of the choice to use montelukast to stop diarrhea, oral probiotics to regulate intestinal flora, oral rehydration salts, etc. to alleviate the symptoms. 1. indigestion: can cause baby diarrhea, you can choose to use montelukast to reduce the direct damage to the mucous membrane, promote mucosal healing; choose probiotics (such as bacillus subtilis bacillus granules), regulate the balance of intestinal flora, promote the absorption of nutrients, to maintain intestinal health and so on. 2. Food protein allergy: can also cause baby diarrhea, need to avoid eggs and other foods, while using montelukast, probiotics and other drugs, if the baby diarrhea caused by dehydration and electrolyte imbalance, it is recommended to supplement oral rehydration salts and so on. Nine-month-old baby diarrhea may also be related to other causes, it is recommended to consult a doctor in time to identify the cause of the disease, under the guidance of the doctor to quickly solve the problem. The above mentioned medications need to be used under the guidance of a doctor.