The child’s head sweat hair are wet may be physiological factors, but also may be the manifestation of certain diseases, such as vitamin D and calcium deficiency. 1. Physiological factors: may be the child’s growth and development is relatively fast, the metabolism is more vigorous, coupled with the children like to exercise, lively and active, so that the skeletal muscle heat production is more, the metabolism increased after the production of a lot of heat, which will appear sweaty situation. 2. Pathological factors: the child may be deficient in vitamin D and calcium, leading to excessive sweating, which is usually accompanied by restless sleep at night, occipital baldness, square skull, chicken chest, funnel chest and other symptoms. This symptom alone is not enough to diagnose the disease, and it may be caused by other factors. It is recommended that the patient should consult a doctor in time to clarify the cause of the disease and give targeted treatment.