There is not enough research data to prove that the components of the New Crown vaccine are secreted through breast milk. Physiologically and from previous experience with other vaccinations, it is possible that antibodies and immune cells produced by the body stimulated by the vaccine may passively enter breast milk, and that antibodies in breast milk have a strong neutralizing ability and may provide potential protection to breastfed infants and children. However, it is not recommended for lactating women to receive the New Coronavirus vaccine, mainly because it is not clear what effect the New Coronavirus vaccine will have on themselves and their infants after the vaccination of lactating women, so generally lactating women can delay the New Coronavirus vaccination. In addition, our Technical Guidelines for Vaccination against New Coronavirus recommend that lactating women at high risk for New Coronavirus infection should be vaccinated, such as health care workers, those who have frequent contact with medical personnel, or those in moderate-to-high risk areas. If you have received the neo-coronavirus vaccine and have not experienced any adverse reactions, you can continue breastfeeding. If you experience adverse reactions, such as mild fever, dizziness, or drowsiness, no special treatment is required for mild symptoms, but if you experience more severe symptoms, you should stop breastfeeding and promptly report to your doctor, and it is recommended that you breastfeed again after the adverse reactions have subsided. Within 1 week after vaccination, you should pay attention to rest, avoid strenuous exercise, spicy and stimulating food, and avoid drinking alcohol to help the vaccine produce a good immunization effect. It is important to note that immunity does not develop immediately after vaccination, and it usually takes about 2 weeks for the vaccine to have a protective effect, and it is not possible to have 100% immunity after vaccination, so it is still necessary to take necessary protective measures after vaccination, such as wearing a mask when traveling and keeping a safe distance.