Infants should not bathe until 24 hours after vaccination. Because infants have tender skin and low resistance, if they bathe too soon after vaccination, especially after getting wet with unclean water, the probability of infection and inflammation at the injection site will increase, and colds and fever may also occur as well as cause delayed recovery of the wound. Parents are advised to bathe their infants one day before vaccination. After 24 hours of vaccination, the infant can take a bath if there are no symptoms of discomfort, and the bath must be in clean, warm water, avoiding the injection site from getting wet, and not rubbing the injection site with a towel after washing. Some infants may experience allergy, nausea, vomiting, fever and other symptoms after vaccination. Mild symptoms can be observed at home first, but if the symptoms do not subside or are more serious, they should go to the hospital as soon as possible.