The body’s temperature depends on many factors and is controlled by a part of the brain. Body temperature varies over the course of the day, although the brain usually is able to maintain it within a relatively narrow range. The brain regulates temperature by balancing heat production in the muscles and the liver with heat loss from the skin and lungs.
Infant fever occurs when the brain increases the baby’s body’s temperature. This may be in response to chemical signals released into the bloodstream when the immune system detects an infectious agent, such as a bacteria or a virus.
