After drying the term or moderately preterm infant after birth, which heat loss mechanism will dominate?

• A. Conductive
• B. Convective
• C. Radiant
• D. Evaporative

Answer: (C)

After birth, newborns lose heat through four main routes. Evaporation is the largest heat loss mechanism right away because the skin is wet from amniotic fluid. Once you have dried the infant, evaporative loss drops dramatically, and radiant heat loss becomes the dominant mechanism. Radiant loss occurs when the baby transfers heat to cooler objects or surfaces in the room (like walls or an incubator) without direct contact. In a typical environment, this radiative transfer often surpasses other routes once the infant is dry, especially if surrounding surfaces are cooler or the room isn’t well warmed. Conductive loss (to a surface in contact) and convective loss (air moving past the skin) persist but are generally smaller than radiant loss after drying, provided appropriate warming measures are in place. Keeping the infant's surroundings warm, using radiant warmth, minimizing drafts, and employing skin-to-skin care or hats and warming blankets all help reduce radiant heat loss.