Five and a half month baby diarrhea is often caused by indigestion, enteritis and other conditions, can be general treatment, oral medication for treatment. 1. indigestion: five and a half month baby diarrhea may be due to improper feeding and care and other conditions caused by indigestion, at this time it is usually recommended to use bifidobacteria and other probiotic drugs to regulate the intestinal flora, for treatment. When diarrhea is severe, montelukast can be given to stop diarrhea. 2. enteritis: enteritis due to infection can also cause diarrhea in five and a half month old babies. If the bacterial infection, according to the drug allergy can use cefixime and other antibacterial drugs; if the viral infection, with self-limiting, can not special treatment. If the diarrhea is serious, we should also pay attention to the use of rehydration drugs such as rehydration salts, and can also give montelukast to stop diarrhea. If your five and a half month old baby has diarrhea that has not improved, or is accompanied by other symptoms, we recommend that you seek medical attention. The above medications should be used in accordance with medical advice.