Redness and swelling at the place where the infant received the vaccination can be temporarily observed and handled, and attention should be paid to whether there is a manifestation of infection for this reason, and if it is accompanied by pain, blood oozing and seepage, or other abnormal symptoms, it is necessary to go to the hospital in a timely manner for medical treatment. Infants after vaccination, the injection site appears red, swollen, hard knot, pain, itching, etc., this situation is mostly a transient general vaccine reaction. It can be temporarily observed and followed up for treatment. However, if the injection site remains red and swollen, or if there is oozing of blood, oozing of fluid or other abnormal symptoms, you should consult a doctor in time, except for infections, and follow the doctor’s instructions for treatment. If an infant develops severe allergic reactions such as hives, respiratory distress, or shock after vaccination, he/she should go to the hospital immediately for treatment. If medication is needed, it should be used under a doctor’s supervision.