|MadSci Network: Medicine|
Shivering is a means of thermoregulation (controlling body temperature) which can generate heat by muscle activity. Infants are thought not to be able to do this due to poor development of muscle tissue. Instead, infants use nonshivering thermogenesis (heat production) as a means of generating heat. This is accomplished in infants by basically burning fat using their storage of brown adipose(fat) tissue(a mammalian heat-producing tissue occurring especially in human newborns and in hibernators ) which is found in infants up to one year of age and in some adults acclimated to the cold. hope this helps, gabriel vargas, md/phd References: Human Adaptability:An introduction to Ecological Anthropology Emilio F. Moran
Try the links in the MadSci Library for more information on Medicine.