What causes heat loss in a newborn with wet skin?

Heat loss in a newborn with wet skin occurs primarily due to evaporation. When the skin is wet, moisture on the surface evaporates, and this process requires heat energy. As the liquid water transforms into vapor, it absorbs heat from the newborn's body, resulting in a decrease in the body temperature. Newborns are particularly susceptible to heat loss this way, as they have a high surface area to volume ratio and limited insulating fat, making it crucial to keep their skin dry immediately after birth to prevent hypothermia.

Evaporation is a vital consideration in newborn care, especially during the initial moments after delivery when they may be wet from amniotic fluid. Ensuring that the newborn is dried properly and kept in a warm environment can effectively minimize heat loss through this mechanism.