Which physical finding is most consistent with a postmature newborn?

Which physical finding is most consistent with a postmature newborn?

• A. Good muscle tone
• B. Full, smooth skin
• C. Thin, loose skin with little fat
• D. Thick subcutaneous fat

Answer: (C)

Postmature newborns typically show diminished fat stores and wrinkled, dry skin. After an extended gestation, fat stores are depleted and the skin loses subcutaneous padding, giving a thin, loose, and perhaps parchment-like appearance. This description matches the option describing thin, loose skin with little fat, which is the hallmark finding for a postterm infant. In contrast, full, smooth skin or thick subcutaneous fat would suggest adequate fat reserves typical of term or well-nourished infants, and good muscle tone is not a distinguishing feature by itself.

Postmature newborns typically show diminished fat stores and wrinkled, dry skin. After an extended gestation, fat stores are depleted and the skin loses subcutaneous padding, giving a thin, loose, and perhaps parchment-like appearance. This description matches the option describing thin, loose skin with little fat, which is the hallmark finding for a postterm infant. In contrast, full, smooth skin or thick subcutaneous fat would suggest adequate fat reserves typical of term or well-nourished infants, and good muscle tone is not a distinguishing feature by itself.