You can use a breast pump to suck the milk during breastfeeding, which has many benefits, such as promoting milk secretion and preventing breast diseases. 1. Promote the secretion of milk: when breastfeeding, the milk secretion is more vigorous, which will cause the breast to be full, if the baby did not drink in time, you can use the breast pump to empty the excess milk, but also help the mammary glands to secrete milk again, and the secretion of new milk will be more helpful to feed the baby. 2. Preventing Breast Disease: If the breasts are emptied in time, there is no risk of mastitis or other diseases due to residual milk. It is important to note that the breast pump should be used correctly to suck the milk, not to squeeze by hand, otherwise it may stimulate the inflammation of the mammary gland. It is important to note that if the milk during the weaning period, you can use a breast pump before weaning, but during the weaning period you can not use a breast pump, which will lead to the failure of weaning, but the pain is serious, you can use a breast pump a small amount of sucking out to ease the pain.