Taking penicillins (e.g., amoxicillin, etc.) or cephalosporins (e.g., cefadroxil, etc.) for mastitis does not affect breastfeeding. The pathogen of mastitis is usually Staphylococcus aureus, so usually do not need to wait for the results of drug sensitivity test, you can use penicillin drugs (such as amoxicillin, etc.), or cephalosporin antibiotics (such as cephradine, etc.), the application of these drugs will not affect the health of the baby, you can breastfeeding normally. For those who only have breast milk stagnation but have mild systemic symptoms, active measures should be taken to promote the discharge of breast milk, such as maneuvering to empty the breasts, ultrashort wave physiotherapy and so on. The use of medication during breastfeeding requires caution, and patients are advised to go to a regular hospital, use medication under the guidance of a doctor, and consult a doctor at any time when there is a change in their condition.