Hepatitis B virus carrier, also known as hepatitis B minor triplet, or major triplet. Many people become infected with the hepatitis B virus from the mother, so mothers-to-be who are hepatitis B positive are particularly worried about infecting their fetus in the same way. Nowadays, there are highly effective hepatitis B immunoglobulin and hepatitis B vaccine, which can protect the majority of newborns as long as they are injected in the correct way. Whether the baby is delivered naturally or by cesarean section, the baby is most likely to become infected when it is exposed to the hepatitis B virus from the mother’s blood immediately after delivery. What needs to be done now is to give the baby hepatitis B immunoglobulin immediately, the sooner the better. The baby can be protected half an hour after the injection. It is important to note: after the injection it is only in the baby’s body for 45 days, so how does the baby get protection next? On the day of birth, we have to give the baby the hepatitis B vaccine, and then 30 days later we give the second dose of hepatitis B vaccine. Then, on the 37th day after birth, the baby produces hepatitis B antibodies on his own, and he protects himself. Six months later, a booster shot of hepatitis B vaccine is needed. After taking these measures, about 90% of the children are protected and the mother can breastfeed with confidence. When the child is 7 months old, he/she needs to be checked at the hospital to see if he/she has developed antibodies, or is infected with the hepatitis B virus, or nothing at all, so that appropriate measures can be taken.