Normal full-term newborns gain 10-30 grams of weight per day, with an average of 20 grams per day. One month’s weight gain is normal as long as it is above 600 grams, and the amount of urine in 24 hours should be more than 6 times. If the child is quiet and not irritable after feeding, and can go to sleep quickly, it means that he or she is feeding properly. It should be noted that some newborns go through a physiological weight loss period, regardless of whether they are full-term or premature. The physiological weight loss in full-term babies is about one week after birth, with a 10% weight loss; in preterm babies, the physiological weight loss can last until about two weeks, with a 20% weight loss. After the physiological weight loss period, the baby will gain weight normally. Therefore, newborns who do not go through the physiological weight loss period will gain around 200 grams in 10 days; newborns with physiological weight loss period will gain less weight.