The crying of young children in the middle of the night may be related to physiological reasons such as thirst, hunger and improper care, as well as pathological reasons such as vitamin D deficiency, colic, eczema and respiratory tract infections. 1. Physiological reasons: If the toddler is thirsty or hungry in the middle of the night, he may cry, or some toddlers may cry after defecation or urination, and if the sleeping environment is too noisy, too hot, too cold, etc., all of which may lead to toddlers crying in the middle of the night. 2. Pathological causes: toddlers crying in the middle of the night may also be due to pathological conditions, common intestinal colic, all of a sudden come to the crying, not easy to appease, but after a period of time can be relieved, vitamin D deficiency rickets in addition to toddlers crying in the middle of the night will also have sweating, easy to wake up, easy to startle and other manifestations. In addition, eczema, as well as respiratory infections and other diseases can cause discomfort in young children, resulting in crying in the middle of the night. If your toddler’s crying in the middle of the night doesn’t get better or is accompanied by other symptoms, it is recommended that you go to the hospital in time.