Small children love to sweat when sleeping, may be physiological causes, may also be caused by pathological factors. 1. Physiological factors: for children, especially newborns, due to their sweat glands and nervous system development is not yet perfect, this time sweating is also the baby to adapt to the high temperature environment to make a protective response, so sleep sweating. Because the evaporation of sweat will take away the heat of the body surface, is the baby to adapt to the external high temperature environment and make the protective response. 2. Pathological factors: for the baby sleep sweating may also be due to disease, such as tuberculosis, sepsis, rickets, obesity, hypoglycemia and so on. When the baby sleep sweating, it should be clear whether it is physiological or pathological, if necessary, should go to the regular hospital, and under the guidance of the doctor to deal with.