Most newborns do not experience any discomfort after receiving the hepatitis B vaccine, but only a few of them may develop fever with a rash at the injection site, which is mainly caused by allergy to the vaccine. Hepatitis B is a chronic infectious disease that seriously threatens the health of our people and can cause hepatitis, liver fibrosis, liver cirrhosis and even liver cancer. For hepatitis B carriers, regular medical checkups for liver disease are recommended every six months. In our country, in order to reduce the incidence of hepatitis B, all newborns are vaccinated against hepatitis B free of charge. It takes half a year for the whole process of hepatitis B vaccination. After receiving the hepatitis B vaccine, the body will be able to produce enough hepatitis B surface antibodies to defend against hepatitis B virus infection.