The most common adverse reactions in babies after polio vaccination are rash and diarrhea, which usually heal themselves in 2-3 days, while fever is not very common, so if fever occurs after polio vaccination, it should be taken very seriously. If your baby’s temperature returns to normal about 3 days after the fever and then increases again after about 1-6 days, pay attention to whether it is vaccine-associated poliomyelitis. In addition to monitoring the body temperature, pay attention to the movement of the baby’s limbs. If your baby is irritable, crying and restless with reduced movement of the limbs, go to the hospital promptly because paralysis can occur when vaccine-associated poliomyelitis occurs.