The booster vaccine can be withheld during breastfeeding and can be given after breastfeeding has ended. Neocoronavirus vaccine is an inactivated virus vaccine that is effective in preventing neocoronavirus infections. It is necessary to follow the doctor’s instructions for vaccination and to exclude contraindications such as acute phases of the disease. However, because the effect on pregnancy and breastfeeding is not yet clear, it is not recommended to receive the third booster shot during breastfeeding, but can be administered under the supervision of a doctor after breastfeeding is over. After vaccination, it is necessary to take proper rest, avoid exertion and strenuous exercise, eat a light diet, and avoid spicy and stimulating foods and seafood. Local redness, swelling, hardness, pain and other reactions may also occur at the vaccination site, usually in 1-2 weeks or so can be recovered, do not need special treatment, but when the hardness increases, you need to go to the hospital in a timely manner.