Breastfeeding is a small and large bias because of improper feeding, which can be relieved by improving the feeding method, and if the milk stagnation leads to the occurrence of mastitis, the treatment includes medication and other ways to treat it. During breastfeeding, if the child is used to eating more on one side, it will cause different milk production on both sides of the breast causing partial milk. Usually, there is no need to worry too much, but you can improve your feeding style to ease the problem of partial breastfeeding. For example, every time you breastfeed, you can try to feed the smaller breast first, promote milk secretion through sucking, and massage and apply warm compresses to the side with less milk. If milk stagnation leads to mastitis, you can use medication as prescribed by your doctor. For example, penicillin, penicillinase-resistant benzathine sodium, and cephalosporin generation antibiotics (e.g., cephradine) can be used to treat and eliminate the infection. Erythromycin may be used in patients who are allergic to penicillin. In order to avoid drugs affecting the baby’s health through breast milk, therefore drugs such as tetracycline, aminoglycosides, quinolones, sulfonamides and metronidazole generally need to be avoided. If you feel unwell, you should go to the hospital in time to avoid delaying your condition or triggering adverse reactions.