In fact, there is no such thing as congenital hepatitis B. It generally refers to hepatitis B virus infection caused by mother-to-child route, which is also contagious to a certain extent, but the contagiousness is relatively low. Hepatitis B at birth is usually transmitted from mother to child, where the mother suffers from Hepatitis B, causing the baby to be infected by the virus during birth. However, babies can usually be treated with Hepatitis B blocking therapy after birth, which can effectively prevent Hepatitis B virus infection. However, there are a few infants who are infected with the hepatitis B virus, but due to the progression of the disease and the lack of timely treatment, the disease becomes chronic hepatitis B, which is contagious to a certain extent. For hepatitis B virus infection caused by mother-to-child transmission, timely treatment should be given to infants to avoid aggravation of the disease and the formation of chronic hepatitis B. Moreover, they should go to the hospital for regular review, and their family members should be vaccinated with hepatitis B vaccine.