After the hepatitis B vaccination, it is important to observe the baby’s body temperature and whether a local rash appears. In addition, do not touch the injection site for three days. If there is a low fever or local rash, do not panic, as it usually recovers on its own in 1-2 days and does not require special treatment. The hepatitis B vaccination can produce effective hepatitis B surface antibodies to defend against hepatitis B virus infection. After the 3 doses of hepatitis B vaccination, the hepatitis B two-and-a-half test is generally required every other month.