If your newborn cries after the hepatitis B vaccination, observe whether there is a rash at the local injection site or whether there is a fever. If neither of these conditions occurs, it is mainly due to pain and will slowly improve. 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. China is a major hepatitis B country, and most people are infected with hepatitis B due to mother-to-child transmission at birth. In order to reduce the probability of hepatitis B infection, all newborns are given the hepatitis B vaccine. The higher the concentration of hepatitis B surface antibodies, the stronger the defense against the hepatitis B virus.