The benefit of the Hepatitis B vaccine for infants is that it prevents infection with the Hepatitis B virus. The Hepatitis B vaccine is a vaccine for an infectious disease caused by the Hepatitis B virus that causes damage to the liver and other organs. Hepatitis B vaccination can make the immune system in the infant’s body to produce hepatitis B surface antibody, this protective antibody can remove or neutralize the hepatitis B virus, so that the infant can avoid being infected by the hepatitis B virus, so that the human body can produce immunity to prevent hepatitis B, to prevent hepatitis B virus infection, and it is not damaging to the liver. Hepatitis B vaccine is mainly used for infants and other hepatitis B susceptible individuals, and is injected intramuscularly in the deltoid muscle of their upper arm. Vaccination is given at twenty-four hours, one month, and six months after birth, with 10μg per injection. A small number of infants and young children may experience redness, swelling, itching or hard nodules at the site of vaccination, as well as varying degrees of fever after vaccination, which will usually subside within a few days on its own, but if the symptoms are not relieved after a long period of time, it is necessary to consult a doctor promptly.