After a woman has completed childbirth, her breasts undergo lactation changes and the milk produced will supplement the necessary daily energy and nutrients for the newborn, so the composition of the milk is a major concern for new mothers. If you accidentally get an upper respiratory infection while breastfeeding, there is no need to be overly alarmed as a mild upper respiratory infection will not have any effect on breastfeeding. However, if oral medication is needed to treat an upper respiratory tract infection during breastfeeding, it should be taken seriously by the mother. Some medications are contraindicated during breastfeeding because some of their ingredients are absorbed by the mother and can be secreted into the milk through the mammary glands. These medications can enter the newborn’s body with the milk and cause unwanted effects on the newborn. Therefore, it is important to be careful when choosing drugs, and to use drugs that can be taken orally during breastfeeding. If the symptoms of upper respiratory tract infection are severe and the patient has persistent high fever, coughing and sputum, you can temporarily stop breastfeeding and consult the fever clinic of your local hospital to clarify the cause of upper respiratory tract infection, and after excluding specific infectious diseases, you can breastfeed normally. In summary, breastfeeding cold should be under the guidance of a doctor to choose the drugs that can be taken, such as cold symptoms are serious, need to seek medical attention in a timely manner, if necessary delay the condition.