If acute mastitis is severe, breastfeeding is not advisable, and it is necessary to express milk daily. Prevention of acute mastitis is more important than treatment, especially during breastfeeding periods where it is crucial to keep the nipples clean. Frequently wash them with warm soapy water and clean the nipples before and after breastfeeding with 3% boric acid solution. For those with inverted nipples, gently extract the nipple before cleaning; however, do not use ethanol wipes as ethanol can make the nipple and areola skin brittle, which can lead to cracking. Develop good breastfeeding habits, nurse regularly, and ensure that the milk is thoroughly drawn out each time. If unable to completely draw out the milk, use hand massage to express it or a breast pump. Additionally, do not let the baby sleep with the nipple in their mouth. If there is nipple damage or cracking, stop breastfeeding and use a breast pump to express the milk until the wound heals, and then resume breastfeeding.