There are no known adverse effects of the novel coronavirus vaccine on infants during breastfeeding. The novel coronavirus vaccine is an inactivated vaccine that does not adversely affect breast milk when administered during breastfeeding, so it is recommended that the vaccine be administered during breastfeeding. The new coronavirus vaccine is recommended because it is effective in reducing the risk of infection with the new coronavirus. Slight redness, swelling, pain, low-grade fever, malaise and nausea at the vaccination site may occur after vaccination, which can be relieved on their own in most cases and do not affect breastfeeding. If symptoms of high fever occur, or the above symptoms worsen, it is necessary to suspend breastfeeding, go to the hospital in time to clarify whether treatment is needed, and then breastfeed again after the symptoms disappear. In addition, after vaccination, you need to wait in the observation area for thirty minutes and leave only if there are no symptoms of discomfort.