Exclusive breastfeeding on demand is sufficient for a 22-day-old newborn, with formula milk 30-120 ml each time, about 8 times a day, but it needs to be considered in conjunction with the child’s condition. The average full-term newborn will gain about 30g per day and 1-1.5kg within 28 days after birth. If the newborn’s weight gain is within the normal range, it indicates that the amount of milk consumed is normal. If you are exclusively breastfeeding, you can breastfeed on demand, feeding when the baby is hungry or when the woman’s breasts are swollen. If the baby is formula-fed, 30-120 ml of milk can be fed at a time. Some newborns have a good appetite and eat slightly more to meet their growth needs. Parents can also judge whether the amount of milk feeding is sufficient based on the newborn’s urination. If the newborn’s urination is 6-8 times a day, it means that the amount of fluid is more than sufficient. Parents can observe whether the newborn sleeps soundly after feeding, whether the spirit is good, whether the amount of urine and feces and whether the weight growth is normal to judge whether the feeding is reasonable.