Newborns do not have enough to eat the performance of crying, urination and defecation, weight gain. 1. Crying: newborns are fed on demand, after eating milk can sleep quietly, if the milk is very hard, sucking soon fell asleep, sleep less than 1 ~ 2 hours and wake up crying, or sometimes sucking the milk, this is also a newborn did not eat enough performance. 2. Reduced urination and defecation: breastfed newborns, normal stools are golden yellow or yellowish, 2 to 4 times a day, each time the amount of urine can be soaked through the diaper, if you do not have enough to eat, more green stools, urinate less often and less. 3. weight does not increase: if the newborn baby weight growth is slow for a long time, and exclude the possibility of suffering from a certain disease, it is possible that the newborn baby did not eat enough to cause. If the above phenomenon occurs, find out the reason in time, if it is caused by not eating enough. Timely change the method of breastfeeding.