Sweating at night can be caused by physiological reasons, respiratory infections, vitamin D deficiency, tuberculosis and other factors. 1. Physiological reasons: at night, when the temperature is high or the bedding is too thick, it will easily lead to sweating, which is a normal physiological phenomenon. 2. Respiratory infections: If a child suffers from respiratory infections, it will easily lead to poor immunity and cause night sweating. 3. Vitamin D deficiency: when young children have long been partial or picky eaters, it will easily lead to vitamin D deficiency, rickets, resulting in night sweating. 4. Tuberculosis: If a young child suffers from tuberculosis, it may be caused by tuberculosis mycobacterium infection, which is mainly manifested in more sweating at night, and also accompanied by weakness, low fever and other symptoms. The toddler night sweating, exclude physiological reasons, parents should take the baby to the hospital in time, improve the examination to clarify the cause of the disease, and then give the appropriate treatment and therapy.