If the father has hepatitis B, the child may have hepatitis B as well. Hepatitis B is a viral hepatitis caused by the hepatitis B virus, which is contagious and spreads mainly through blood and body fluids, mother-to-child transmission and sexual contact, and a very small amount of contaminated chronic hepatitis blood or body fluids can cause viral infections when they enter the body. If you share a razor, toothbrush or pedicure with a patient, it will cause the virus to spread through broken skin or mucous membranes. In addition, saliva and sweat also contain the virus, which may cause cross-infection if they are in close contact. So if the father has Hepatitis B, the child may also have Hepatitis B. Hepatitis B is usually prevented by vaccination against hepatitis B. If the father has hepatitis B, the child should be vaccinated against hepatitis B after birth, and it is also recommended that family members be vaccinated against hepatitis B to avoid cross-infection.