If you cough with phlegm during breastfeeding, you need to find out the cause, such as acute bronchitis, pneumonia, etc., and choose antibiotics, proprietary Chinese medicines, cough suppressants and phlegm removers according to the cause of the disease. 1. Antibiotics: For bacterial or mycoplasma chlamydia bronchitis and pneumonia, you can use sensitive antibiotics that can be used during breastfeeding, such as cefuroxime, macrolide antibiotics such as erythromycin. The use of quinolones such as levofloxacin is prohibited during lactation. 2. Proprietary Chinese medicines: If the cough and phlegm caused by colds are self-healing, you can drink more water and use proprietary Chinese medicines such as Shuanghuanglian Oral Liquid to assist in the treatment; 3. Cough and phlegm medicines: For those who have a cough with much phlegm, thick and difficult to cough out, you can choose cough and phlegm medicines, such as Chuanbei cough syrup. There are many reasons for coughing up phlegm, it is recommended to go to the hospital to identify the causes of targeted treatment.