There is breast milk in late pregnancy or after the delivery of the fetus or placenta. Each woman’s physical condition is different, and the time when breast milk appears is also different. Some women’s breasts secrete breastmilk in late pregnancy, the amount of milk is relatively small at first, with the increase of pregnancy weeks, the amount of milk secretion may gradually increase. Most women are waiting for the fetus, placenta delivery, the body estrogen and progesterone levels rapidly decline, the newborn sucks the nipple, there will be milk secretion. Early contact and early sucking after the birth of a newborn is favorable to the effective secretion of milk, and sufficient milk secretion can continuously supply the needs of infants, provide infants with high-quality, comprehensive and sufficient nutrients, and promote the development of organs and the maturation of functions. The amount of breastmilk at the beginning after the birth of the fetus will be relatively small, or there may be no breastmilk secretion for three to five days, which is related to the individual’s physical condition. Breastfeeding women should pay attention to nutritional supplements, pay attention to rest, and maintain a stable mood, which is conducive to the normal growth and development of the baby.