What is a key feature of an infant with macrosomia?

A key feature of an infant with macrosomia is a round face and chubby body. Macrosomia, defined as a birth weight greater than 4,000 grams (about 8 pounds, 13 ounces), typically indicates that the infant has an excess of body fat. This characteristic can result in a rounded facial appearance and a more robust physique, as the high birth weight often reflects higher levels of adiposity.

In contrast, other features such as long limbs and thin body would not be typical in macrosomic infants, as these infants usually present with more weight concentrated in body fat rather than lean muscle or long limbs. Low birth weight is explicitly at odds with the definition of macrosomia, while a pale complexion does not specifically characterize infants with macrosomia. Instead, rounded features and a more substantial body shape accurately represent the physical attributes of macrosomic infants.