The nurse assesses a newborn infant. Which assessment finding places the infant at greatest risk for fluid loss?

A. Lanugo is the fine hair covering a newborn’s body that helps protect the skin. Its presence or replacement with vellus hair is a normal developmental finding and does not directly affect the newborn’s risk for fluid loss. B. Cradle cap, or seborrheic dermatitis, is a superficial scaling of the scalp. It is a cosmetic and dermatologic condition that does not increase fluid loss or compromise skin integrity systemically. C. Vernix caseosa is a white, cheesy substance covering the skin at birth. It protects the skin from amniotic fluid in utero and assists with thermoregulation and moisture retention initially. Its presence at birth actually reduces the risk of fluid loss rather than increases it. D. Newborns, especially preterm infants, have thin, immature, and highly permeable skin, which allows for increased transepidermal water loss. This places the infant at greatest risk for dehydration and fluid and electrolyte imbalances. The skin’s barrier function is underdeveloped, making thermoregulation and fluid retention more challenging. Newborns with this skin characteristic require careful monitoring of hydration status, fluid intake, and temperature control to prevent complications.