The polio vaccine is the polio vaccine, and its main role is to prevent poliomyelitis caused by poliovirus types I, II and III. The polio vaccine is suitable for babies who are two months and older, with the first dose of inactivated polio at two months, followed by one dose at three months and one dose at four months and four weeks of age. Some babies may develop fever, diarrhea, and in some cases, irritability and vomiting after vaccination, which usually resolves on its own in 2-3 days.