After a baby eats the saliva of a hepatitis B carrier, parents first need to clarify the viral load of the hepatitis B patient and whether he or she is in the active stage, and at the same time seek medical attention as soon as possible to have the baby vaccinated with hepatitis B high-valent immune globulin and hepatitis B vaccine. If the baby has been vaccinated against Hepatitis B at birth, there is usually no problem if the baby accidentally ingests saliva from a Hepatitis B carrier. However, if the baby has not been vaccinated against Hepatitis B and the Hepatitis B carrier is still very active in viral replication, there is a risk of being infected with Hepatitis B if the baby eats the saliva of a Hepatitis B carrier. Hepatitis B can be prevented from occurring by giving the baby Hepatitis B High-Value Immunoglobulin and Hepatitis B Vaccine, and by regular rechecking of the hepatitis markers. If a hepatitis B carrier has been treated with antiviral therapy and the virus is no longer replicating, then even if a small amount of saliva from a hepatitis B patient is eaten, hepatitis B infection is usually not expected. If a baby eats the saliva of a hepatitis B carrier, it is recommended that the baby should seek medical attention in time, and under the guidance of a doctor, carry out post-exposure treatment, and at the same time improve the relevant examinations to clarify whether hepatitis B infection, and take the appropriate treatment measures.