Eight months the child sleeps at night crying, common environment temperature is too high or too low, the child exists hunger, want to urinate and defecate and other physiological factors, when exclude the above situation, the child will sleep peacefully. There are also during the disease, when there is fever, abdominal pain, sore throat, cough and other symptoms, there will be night crying and restlessness, to the hospital in time to treat the original disease. In addition, vitamin D deficiency rickets will appear to cry at night, accompanied by symptoms such as square skull, occipital baldness, rib ectropion or chicken breast. After giving vitamin D and calcium supplements, appropriate amount of outdoor activities, sun exposure, and adding supplemental food reasonably, it will be improved gradually.