The breast pump can usually be used after delivery, but it is usually recommended that breastfeeding be done in person as much as possible to help build intimacy and foster parent-child bonding. The breast pump can also be used if the mother has breast milk, mastitis or other special circumstances such as being unable to breastfeed herself, having more breast milk, needing to go to work, or being sick. 1, breast milk is not down: if the milk is not down for 3 days after delivery, you can let the baby suck more during this period. If the mastitis is difficult to control because of the accumulation of milk in the breast, you can use a breast pump to suck out the milk to promote the mastitis to subside; 3, unable to personally breastfeed: if the baby is born, there is neonatal asphyxia, prematurity and other conditions, at this time, you need to be admitted to the neonatal ward alone, the mother is not convenient to personally breastfeed, you can choose to use a breast pump to suck out the breast milk, and then sent to the hospital for breastfeeding; 4, breast milk If the mother has too much milk, the baby may not be able to finish it, which may lead to mammary gland blockage and even acute mastitis, you can also use a breast pump to suck out the extra milk and store it in the refrigerator for 3-6 months, so that it can be frozen and fed to the baby when needed; 5. Breast milk can be sucked out with a breast pump and stored in the refrigerator to be warmed up and fed by family members when the baby is hungry; 6. When the mother has finished using the breast pump, she should wipe her breasts with clean wipes and keep them clean and dry at the same time. The breast pump needs to be soaked in hot water or disinfected using a wave oven to reduce the possibility of bacterial infection.