The most important indicator of whether breastmilk is sufficient is whether the baby has normal weight gain and urinates more than 6 times a day. The weight gain of a newborn is about 1 kilogram. The average growth is 30 to 40 grams per day. If the weight gain is normal, there is nothing to worry about. If the weight gain is not good, it is very important to improve the feeding posture, which can be summarized as “three stickers”, “three postures” and holding the areola. (1) The baby’s mouth and jaw are close to the mother’s breast; (2) The baby and the mother’s chest are close to the chest; (3) The baby and the mother’s stomach are close to the stomach. Three postures: 1) the mother sits and feeds; 2) the mother lies down and feeds (suitable for nighttime), but the mother should not fall asleep in order to avoid suffocation of the baby; 3) the mother carries the baby in her arms and feeds (suitable for cesarean section mothers). Containing the areola is for the baby’s mouth to contain the mother’s nipple and areola for the best sucking. If after efforts, the weight gain is still unsatisfactory, you can use an electric breast pump to suck out the breast milk to see how little there is. Generally, the baby’s milk volume at this time should be around 500 ml per day, divided into 8 times, each time for 60 ml. If the breast milk is sucked out for 30 ml per time, it should be supplemented with 30 ml of formula every time after breastfeeding. Eat mother’s milk first, then formula, and feed with a spoon, so as not to cause nipple illusion, which will affect the absorption of sucking mother’s milk. Breastfeeding during the day can increase breast milk secretion, and with the increase of breast milk, gradually reduce or stop feeding formula.