A lot of sweat on the child’s head may be related to the child’s metabolism, environmental temperature and other physiological factors, as well as rickets and other pathological factors. 1. Physiological factors: the child’s own metabolism is more vigorous, if the child sleeps with a thick cover, or the room temperature environment is relatively high, resulting in their own heat can not be well dispersed, there will be a lot of sweat on the head of the child sleep. 2. Pathological factors: If the child is chronically deficient in vitamin D and calcium, it will lead to rickets. Rickets children will not only sweat when they sleep, but also accompanied by occipital baldness, square skull, unstable sleep at night, waking up frequently at night and other symptoms. If the child sleeps with a lot of sweat on the head symptoms have not improved, or accompanied by other symptoms, it is recommended to go to the hospital in a timely manner, to clarify the cause of the disease to give targeted treatment or treatment.