When Do Infants Start Sweating?

Infants sweat as soon as they are born but it is not until the first six months of their lives that babies begin to show signs of excessive sweating. Until then, infants do not produce enough sweat to be visible through the skin (1).

How much does an infant’s body temperature rise?

An infant’s core body temperature rises by up to two degrees Celsius within one hour following birth (2) and this increase in heat can be maintained for several hours or days (3). During this period, an infant does not respond normally to changes in environmental temperatures. Heat loss is increased by up to 50% during these hours; however, after 12-24 hours the normal rate of heat loss begins again. The reason for this delay is unknown but there may be a regulatory mechanism operating during those first few minutes which prevents too rapid a drop in body temperature.

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