Sweating is a common physiological phenomenon in babies, and the evaporation of sweat often leads to a cold back, which is not always a sign of weakness or illness. When the covers are too much, the child’s metabolism is very strong because the brain’s nervous system is not yet well developed and because he or she is in a period of growth and development, coupled with the stimulation of excessive heat, the only way to regulate normal body temperature is to sweat in order to evaporate the heat from the body. Therefore, it is generally not recommended to cover your baby too much at bedtime.