The chances of transmitting the virus to the fetus are very high if the carrier does not undergo mother-to-child interruption. The first aspect is that during pregnancy, if the quantitative level of hepatitis B virus is high, the pregnant woman needs to take antiviral drugs from 24 to 28 weeks of pregnancy to prevent the transmission of the virus to the fetus, the main drug is tenofovir. The second aspect is to give hepatitis B immunoglobulin and hepatitis B vaccine to the newborn as soon as possible after the delivery, which is required to be done within 24 hours, and the earlier the better, to reduce the chance of hepatitis B infection in the newborn.