Newborns sleep suddenly cry and continue to sleep, the more common reasons may be: 1, the nervous system is not mature enough, sleep is not regular, the newborn’s cerebral cortex may be suddenly excited, and sudden inhibition, this neurological development of the characteristics of the natural improvement of the age and do not need to worry too much. 2, the child to urinate and defecate or feel uncomfortable with the diaper. Although newborns do not know how to urinate and defecate on their own, but when there is urine and feces accumulated in the body, he will have obvious discomfort, if the urine and feces are discharged, he may sleep peacefully, then we should check the child’s diaper or diaper. 3, it may be the case that the transient intestinal spasm attack, or a transient intestinal spasm, which does not require special treatment. 4, it may be a manifestation of vitamin D deficiency or calcium deficiency, causing a manifestation of easy to scare. It may be a manifestation of vitamin D deficiency or calcium deficiency, which causes easy to scare, you can try to supplement calcium and vitamin D.