Cold sweats in babies may be related to environmental factors, nutrient deficiencies, hyperthyroidism and other conditions. 1. Environmental factors: it may be due to the high temperature in the room or the baby wears too much clothing or covers too thick, resulting in the baby sleeping with cold sweat. 2. Nutrient deficiency: It may be due to the lack of vitamin D or calcium deficiency, which will lead to excessive sweating during sleep. At the same time, it is accompanied by restless sleep at night, frequent waking up at night, crying, as well as occipital baldness, square skull, chicken chest, funnel chest and other clinical manifestations. 3. Hyperthyroidism: Hyperthyroid babies can also have excessive sweating during sleep due to their high basal metabolic rate. It can be accompanied by irritability and lethargy. If the symptoms of cold sweating during sleep are serious, or have not been improved, it is recommended to go to the hospital in time.