Polio vaccine is used to prevent polio, and the normal vaccination schedule is for administration at 2, 3, and 4 months of age and at 4 years of age. Currently, inactivated polio vaccine is given intramuscularly at 2 months of age and bivalent attenuated polio vaccine is given orally at 3 and 4 months of age and at 4 years of age. Occasional rash and diarrhea after vaccination are common adverse reactions, most of which will resolve on their own and heal spontaneously after 1-2 days. If your baby develops a fever about a week after vaccination, it is important to pay close attention to avoid vaccine-associated poliomyelitis. Also pay attention to your baby’s limb activity, and if it decreases, you need to go to the hospital promptly.