Breast swelling and pain is caused by too much milk in the breasts or poorly functioning milk ducts. It is more obvious in the third day after delivery. Pregnant women mainly show pain in their breasts, and their breasts become hot and hard, and some breasts appear sunken. The rise of milk brings pain to the primiparous mother, and also causes some impact on the baby feeding. How to prevent it: First, let the baby drink milk as early as possible. The baby can suck on the mother’s nipple within fifteen minutes to two hours after birth, and can suck once every two hours, and both sides should take turns to alternate feeding the baby. Both breasts should be emptied after each feeding. You can use a breast pump or an adult to help you suck. Third, do breast health care to prevent breastfeeding from stopping due to cracked and painful nipples. The method of care is also relatively simple, after each feeding squeeze milk evenly applied to the nipple. You can do hot compresses and breast massage when the milk rises, and get a lactation specialist to open the milk ducts and express the milk. In severe cases, you need to see a doctor to prevent breast enlargement. It is not advisable to take medication and food on your own because it involves the need to feed your baby.