The nurse is assessing a newborn with a scaphoid abdomen. Which condition is likely to cause the problem?

A. Enlarged spleen: Splenomegaly typically presents as a localized or generalized protrusion in the left upper quadrant of the abdomen. This would cause a protuberant or asymmetrical abdominal contour rather than a sunken appearance. It is an expansion of visceral volume rather than a deficit. B. Hepatitis: Inflammation of the liver in a neonate often leads to hepatomegaly and potentially ascites. These clinical features result in abdominal distension and an increased girth. A scaphoid abdomen is characterized by a concave shape, which is the opposite of hepatitis-related swelling. C. Macrosomia: This term refers to a birth weight significantly above the 90th percentile for gestational age. These infants typically have increased subcutaneous fat and large visceral organs, leading to a full or protuberant abdomen. It is not associated with the inward sinking of the abdominal wall. D. Dehydration: A scaphoid or sunken abdomen in a newborn is a clinical sign of significant fluid volume deficit. The loss of interstitial fluid and decreased tissue turgor causes the abdominal wall to collapse inward. This requires immediate investigation into the infant's hydration and nutritional status.