Children crying and not sleeping at night may be caused by uncomfortable environmental temperature, hunger or dirty diapers, lack of vitamin D or calcium, gastrointestinal discomfort, by changing the environmental temperature, breastfeeding or changing diapers, supplemental vitamin D or calcium, surgical treatment to alleviate the baby’s crying. 1. Uncomfortable ambient temperature: babies may feel uncomfortable and cry due to overdressing or over-thick bedding, high or low indoor temperature. Observe whether babies are sweating or cold, reduce or increase clothing, adjust the indoor temperature, and stabilize babies’ moods. 2. Hungry or dirty diaper: baby hungry at night, diaper is feces or urine soiled will also cry more than, baby hungry to appropriate feeding, feces to wash the anus in a timely manner, and then replace the clean diaper, the baby comfortable after the baby will not cry again. 3. lack of vitamin D: one month baby body lack of vitamin D, will cause non-specific neurological changes, showing easy to cry, irritable and other symptoms, especially at night crying more obvious, supplemental vitamin D and calcium may improve the symptoms. 4. gastrointestinal discomfort: baby gastrointestinal discomfort, such as abdominal distension, abdominal pain will be crying at night, clear abdominal distension with a hand in the clockwise direction gently rubbing the abdomen, may be able to relieve discomfort. No improvement continue to cry may be intestinal obstruction caused by abdominal pain, serious surgical treatment. Baby crying at night does not sleep to understand the causes, in order to be able to target treatment.