Small babies often appear to cry in the middle of the night, some children will appear to cry at a fixed time every day, the emergence of this phenomenon, parents must actively look for the cause, to see what causes children to cry, so as to carry out symptomatic treatment. First of all, all children should be supplemented with vitamin D on time after birth to promote the absorption of calcium, if not supplemented with vitamin D on time to affect the absorption of calcium, calcium-deficient babies can appear to cry in the middle of the night, timely supplementation of vitamin D after the phenomenon of crying in the middle of the night is improved. Secondly, every child is not born with the law of day and night sleep, after the birth of the baby, whether day or night, most of the time in sleep, with the night feeding and nursing reduction, night sleep time gradually extended, but in the day waking night sleep law has not been formed before, the night may be caused by various physiological reasons to cry, sometimes the mother afraid of children cry at night, affecting the sleep of others. And get up in the middle of the night while walking pat, a few days later may cause the infant does not walk while pat on the bad habits of not sleeping to cry. So the child’s sleep habits are adults to help him develop, in the daily care must pay attention. If the child cries at a fixed time every night, but can be relieved by holding it vertically or by airplane, this situation is considered physiological colic, and it is recommended to do more exhaustion exercises normally and avoid swallowing too much air when eating milk. If the child’s crying at night is caused by otitis media or mouth ulcers, active treatment of the primary disease is needed. Intussusception is a common cause of crying in infants and toddlers, often occurring at night. If intussusception is suspected to be the cause, it is important to seek prompt medical attention. If a child with an inguinal hernia cries in the middle of the night, he or she must be examined promptly for an incarcerated hernia, and if the crying is caused by a hernia, he or she must also seek medical attention promptly. There are physiological reasons and organic diseases for the baby to cry in the middle of the night, so parents must observe carefully and seek medical attention if they suspect organic diseases.