Which newborn is at high risk for cold stress and why?

Which newborn is at high risk for cold stress and why?

• A. Premature babies due to decreased brown adipose tissue
• B. Full-term babies with good nutrition
• C. Infants with high birth weight
• D. Term babies with normal temperature

Answer: (A)

Newborn heat production relies on brown adipose tissue to generate heat through nonshivering thermogenesis. Premature infants have much less brown fat and immature thermoregulation, so they cannot produce heat efficiently. When exposed to cool environments, their heat loss outpaces production, putting them at high risk for cold stress. Cold stress triggers a higher metabolic rate to try to warm the body, increasing oxygen and glucose use and risking hypoglycemia and respiratory distress. By contrast, full-term babies with adequate nutrition have more brown fat and energy reserves, helping maintain normal temperature. Term babies with normal temperature aren’t at elevated risk, and infants with high birth weight aren’t inherently at high risk. So the newborn at highest risk is the premature infant due to decreased brown adipose tissue.

Newborn heat production relies on brown adipose tissue to generate heat through nonshivering thermogenesis. Premature infants have much less brown fat and immature thermoregulation, so they cannot produce heat efficiently. When exposed to cool environments, their heat loss outpaces production, putting them at high risk for cold stress. Cold stress triggers a higher metabolic rate to try to warm the body, increasing oxygen and glucose use and risking hypoglycemia and respiratory distress. By contrast, full-term babies with adequate nutrition have more brown fat and energy reserves, helping maintain normal temperature. Term babies with normal temperature aren’t at elevated risk, and infants with high birth weight aren’t inherently at high risk. So the newborn at highest risk is the premature infant due to decreased brown adipose tissue.