After the hepatitis B vaccination, if the infant cries, look for fever or if there is localized redness or rash on the skin. If there is no particular abnormality, it may be due to pain and there is no need to worry, just give appropriate soothing. If the crying persists for a long time and cannot be soothed, you need to go to the pediatrician in time for examination and treatment. At present, all newborns are vaccinated against hepatitis B. It takes three doses of hepatitis B vaccine, or six months, to complete the vaccination. After receiving the hepatitis B vaccine, children will have good immunity to the hepatitis B virus and will have a high concentration of hepatitis B surface antibodies in their bodies, which will protect them from the hepatitis B virus.