In recent years, with the popularization of breastfeeding knowledge, more and more mothers are eager to give their babies exclusive breastfeeding. As a result, mothers insist on not adding formula to their babies in the early postpartum period even if their own breast milk secretion is still insufficient, resulting in insufficient milk intake for babies, causing excessive weight loss after birth, dehydration, pathological jaundice, and even hypoglycemia in newborns, leading to hypoglycemic encephalopathy and other adverse consequences. This has been a more common clinical phenomenon and should cause parents to be highly alert. When should a newborn baby start breastfeeding after birth? Since newborns are born with less energy and nutrients stored in their bodies, babies need to be supplied with a certain amount of energy and fluids every day in the early days after birth. Therefore, when the mother has not yet started breast milk secretion after birth, she should not let the baby just sit and wait for breast milk, but should let the baby start sucking breast milk within one hour after birth to stimulate breast milk secretion as early as possible; subsequently, if it is determined that there is no breast milk for the time being or the amount of breast milk is late and small, the baby should be given appropriate formula milk in time. This is crucial for the baby to establish intestinal flora, maintain the body’s blood sugar stability and fluid balance, and promote bilirubin metabolism in the later stages. For newborns whose mothers have gestational diabetes, it is more important to start milk as early as possible and pay attention to monitoring blood glucose because they are prone to neonatal hypoglycemia in the early postnatal period. How much milk does a newborn baby need per day in the early postnatal period? In the first week after birth, the baby’s milk demand increases daily. On the first day after birth, the baby should be fed once every 2-3 hours, starting from 10-20ml each time; after a week of birth, the total amount of milk per kilogram of body weight should reach 150ml or more. What most parents struggle with is how to determine if their newborn baby has had enough milk when it is difficult to accurately measure the amount of breast milk in the early maternal period. (1) Judging by the number of times the baby urinates daily: if the milk is sufficient, the baby should urinate 6~8 times a day; if the baby urinates less than 6 times a day, it indicates that the feeding amount is insufficient. (2) Judgment according to the baby’s quiet sleep time after each feeding: if the amount of milk is sufficient, the baby can sleep quietly for 2~3 hours; if the amount of milk is not enough, the baby often cries and fusses after nursing, or sleeps for less than 1-2 hours. (3) Judging by the luster and elasticity of the baby’s skin: if the amount of milk is sufficient, the baby’s skin is soft, lustrous and elastic; if the baby continues to eat insufficient milk, the skin will be dry, wrinkled and other signs of dehydration. (4) Judging by the baby’s weight gain: when there is enough milk, the baby’s weight will grow steadily 5~7 days after birth and increase by more than 30 grams per day on average within one month; if there is not enough milk, the weight will grow slowly or even drop. In conclusion, parents are reminded that breast milk is the best nutritional choice for newborns, but they should not simply pursue exclusive breastfeeding and make their babies suffer from undesirable consequences such as underfeeding. The scientific approach should be that whether breastfeeding, mixed feeding or artificial feeding, the most basic principle should be grasped, which is to let the baby get enough calories and nutrients every day to achieve its stable internal environment and steady growth, to really give the baby a good start in life.