Colostrum can increase the disease resistance of the newborn, the child must eat, breastfeeding is the duty of every mother, not only for the child, but also very beneficial to the mother’s postpartum health recovery. Hepatitis B virus is indeed present in the milk of double-positive mothers. Some people tested for HBsAg by solid-phase radioimmunoassay and found that 71.4% (45/63) of colostrum was positive, suggesting that the newborn can be infected through breast milk. However, epidemiological investigations have failed to confirm this. It has been reported that 53% (45/92) of breastfeeders were HBsAg positive and 60% (35/55) of non-breastfeeders were HBsAg positive. Another found that 23.6% (4/17) of HBsAg positive infants had a history of breastfeeding and 43.75% (28/64) of HBsAg negative had a history of breastfeeding. The above materials suggest that breast milk transmission is not an important transmission route. Therefore, domestic scholars currently have two opinions on this issue: one is that although hepatitis B virus is present in the breast milk of double-positive mothers, the amount of virus is far less than that in blood, and hepatitis B virus does not infect through the digestive tract, and newborns can be breastfed 24 hours after birth and after the first vaccination. Another part of scholars believe that it is safe to not feed. The patient can decide on a case-by-case basis.