There are no four peak lactation periods in clinical practice, but postpartum lactation is mainly based on the secretion of lactogen, which is influenced by estrogen and progesterone levels and reaches its peak 2 hours after delivery, and can be gradually maintained at a higher level than before delivery 24 hours later. In addition, the amount of postpartum lactation is usually related to factors such as anesthesia, delivery method and maternal physical condition, which may vary from one individual to another. 1. anesthesia: the use of anesthetics during delivery may lead to a decrease in prolactin levels, resulting in a significant decrease in postpartum lactation; 2. delivery method: studies have shown that vaginal delivery helps stimulate early breast milk secretion, while cesarean delivery may result in a stress reaction, leading to a decrease in maternal lactation; 3. 3, maternal psychological changes: maternal fatigue in the process of childbirth, coupled with some maternal mood is more nervous, worry, resulting in the hypothalamus, pituitary function is affected, so that the secretion of prolactin reduced, resulting in a decrease in maternal lactation; 4, maternal physical condition: some women due to decreased appetite, eating less, resulting in lack of nutrition, coupled with neurological stimulation and other factors, lactation will be significantly reduced; 5, other: some women due to the presence of appetite, eating less, resulting in a lack of nutrition, coupled with neurological stimulation and other factors, lactation will be significantly reduced. 5, other: some mothers are relatively difficult to breastfeed due to the existence of flattened and invaginated nipples, and sometimes they are prone to nipple cracking, which leads to more resistance from babies when breastfeeding. In addition, prematurely giving the baby milk or other foods instead of breast milk and lacking the stimulation of infant sucking can also lead to relatively low lactation. Although there is no peak lactation period, postpartum nutrition such as eating more fish soup, broth and other high-calorie foods, moderate rest, mental regulation, and correcting incorrect breastfeeding methods are all beneficial to the secretion of breast milk. In addition, colostrum within 5 days after delivery contains a large amount of antibodies, which can protect the newborn baby from bacteria, if not special circumstances, breastfeeding should be insisted on.