The postpartum period of breastfeeding usually lasts 3-5 days, but there are individual differences. On the 2nd day after natural delivery or the 3rd day after cesarean section, mothers start to experience physiological breast swelling, which is caused by hormone secretion that increases the supply of blood and lymphatic fluid. This is a normal physiological phenomenon and usually lasts for about 3-5 days, but there are individual differences, so mothers can be encouraged to breastfeed as early as possible. Breastmilk is the most suitable natural food for babies. Breastfeeding is beneficial to the health of both mothers and babies, as it can provide babies with the nutrients they need for their development, increase the bond between mother and baby, and promote uterine regeneration in the postpartum period, which reduces the risk of mothers suffering from breast and ovarian cancers. During the postpartum period of breastfeeding, mothers should be encouraged to breastfeed on demand and pay attention to nighttime breastfeeding to ensure a smooth transition through the period of breastfeeding.