Night crying refers to children often cry noisily at night, or intermittent episodes or continuous, or even overnight, mostly occurring in children within six months, and now the medical belief that the development of the pediatric nervous system is incomplete, may be due to a number of diseases leading to neurological disorders caused by the occurrence of night crying. There are many reasons for night crying, mainly the following aspects: 1, bedtime excitement or fright, the child is frightened or emotional exuberance after, will not be able to sleep quietly, and then cry. 2, vitamin D deficiency rickets, calcium deficient children tend to cry at night, but also have the corresponding performance, such as sweating, occipital baldness, late closure of fontanelle, square skull, etc.. 3, hunger, environmental factors, regular crying children and hunger has a certain relationship, if breastfeeding, you can let the child hungry to eat, artificial feeding can be appropriate to increase the amount of milk feeding, too much or too little clothing, wrapped quilt, hot and cold stimulation will also make the child cry, the child sleeps in a noisy place, can not sleep quietly, etc., as long as you find the cause, the child feels comfortable, the crying will stop. 4, day and night reversal, the child sleeps more during the day, the night is full of energy, if adults do not play with him because of fatigue, the child will also cry. 5, the impact of disease, gastroenteritis, colds, pneumonia, laryngitis, otitis media, etc. will make the baby feel uncomfortable, causing crying. Children often appear night crying, not only will make the child sleep deprivation affect its growth and development, but also affect the parents’ rest, parents should carefully look for the cause, if it is caused by disease, take the child to the hospital to check, as long as the cause is found, timely removal, the child night crying will certainly improve.