Which finding is a common indicator of preterm delivery in infants?

A flat pinnae, or ears, is often associated with infants who are born preterm. In preterm infants, the ear structure is underdeveloped, and one noticeable characteristic is that the pinnae may appear flat against the head, not yet having developed the typical curve and prominence found in full-term infants. This characteristic can be attributed to the overall lack of development and maturation in various systems within preterm infants, as their bodies have not had the full time to grow and develop in the womb.

In contrast, large head circumference and well-developed muscles are indicators typically associated with full-term infants, as they have had more time for growth and development. Tight skin texture is also not a common indicator of preterm delivery; instead, preterm infants often have more delicate and thin skin due to their underdeveloped condition. Therefore, the presence of flat pinnae serves as a more reliable indicator of prematurity in infants.