Five months after the baby vaccination if the diarrhea situation is more serious is able to eat diarrhea medicine, if the diarrhea symptoms are not serious recommended first observation. If five months baby diarrhea after vaccination symptoms are mild it is recommended to observe first, after vaccination in the production of immunity at the same time, sometimes also lead to systemic reactions, may be manifested as diarrhea, at the same time may also be the body does not adapt to the vaccine, the gastrointestinal stress reaction or intestinal flora disorders, most patients can be in 1-3 days to get better on their own, do not need to take medication. If your baby has severe diarrhea after vaccination in May, you can take diarrhea medicine for treatment, and if the symptoms continue without improvement, you should go to the hospital in time for treatment. All of the above medications need to be used under the guidance of a doctor, avoid self-medication.