Hypothermia in a newborn is defined as a core body temperature below what threshold?

• A. 35°C
• B. 34°C
• C. 36°C
• D. 37°C

Answer: (A)

Newborn thermoregulation is immature, so heat loss happens quickly. A core temperature of 35°C (95°F) or lower is defined as hypothermia in a newborn. This cutoff is used because temperatures at or below this level are closely linked to serious problems such as hypoglycemia, metabolic acidosis, respiratory distress, and poor perfusion, all of which require prompt warming and evaluation. Clinically, preventing heat loss is the priority: dry the baby, place a hat, use skin-to-skin care, and provide warmth with a radiant warmer or incubator as needed. If hypothermia is present, rewarming should be gradual while monitoring glucose and ruling out infection or other causes, along with addressing any underlying issues.