Normally, breast milk is produced within 24 hours after delivery, but there is also the problem of delayed production of breast milk. Generally within half an hour after delivery, close contact between the baby and the mother not only helps the baby to adapt to the external environment, but also helps the mother to produce breastmilk. At the same time, the baby should be allowed to suckle as much as possible, which can promote milk secretion. The milk secreted within 24 hours after delivery is called colostrum, which is small in quantity but rich in nutrients. Some mothers may experience delayed colostrum secretion, which can be improved by breast massage, hot compresses, dietary adjustments and allowing the baby to suckle more. Therefore, breastmilk is usually secreted within 24 hours after delivery. Breastmilk secretion can be promoted by massaging and applying hot compresses on the breasts, and sucking by the fetus, etc. However, the time of colostrum secretion varies among different mothers, and those who have not yet secreted breastmilk for more than 3 days can consult a professional doctor.