If you don’t do a good job of blocking the mother and child, it is possible to infect the baby, so you need to do preventive protection for the baby to avoid the baby being infected by the virus after birth. The dna negative indicates that the mother is a hepatitis B virus carrier, the viral load is normal, usually not contagious, will not be infected to the baby, but need to be given routine vaccination after the birth of the baby hepatitis B vaccine and hepatitis B high-value immune globulin, to help the baby to prevent the hepatitis B virus infection, and at the same time can be considered not to use breastfeeding to reduce the risk of infection. Mothers need to be examined in a timely manner after giving birth, follow the doctor’s instructions for symptomatic management or treatment, pay more attention to rest, adjust the diet structure and regular work and rest, etc., and do a regular review of the work, as well as regular checkups for the baby to ensure that the baby is safe.