Frequent nighttime milk may affect the child’s sleep, lead to excessive obesity, and cause dental caries. 1. affect the child’s sleep: if the child frequently get up at night to eat nighttime milk, the night sleep time will be greatly shortened, thus affecting the child’s sleep quality, the serious may affect the child’s growth hormone secretion, resulting in the child’s stunted growth. 2. lead to excessive obesity: if the child at night to eat night milk more often, it is easy to lead to an increase in the amount of food, resulting in overweight, obesity, and even obesity. 3. Lead to dental caries: Because most children will not brush their teeth again after eating nighttime milk at night, the milk left in the mouth may cause dental caries. Nighttime milk can to a certain extent to ensure that the child’s nutritional supply, but if the night milk is too frequent, may affect the child’s sleep, leading to excessive obesity, causing dental caries, so parents should be based on the child’s situation to properly control the number of night milk.