What is the fine downy hair that covers a newborn infant's body called?

• A. Vernix
• B. Lanugo
• C. Down
• D. Hair Follicle

Answer: (B)

The fine downy hair that covers a newborn infant's body is called lanugo. This soft and silky hair typically develops during fetal growth and serves several purposes. In the womb, lanugo helps to hold the vernix caseosa (a white, creamy substance that protects the skin) against the baby's skin, facilitating the baby's ability to maintain warmth and providing a bit of insulation.

Lanugo usually appears on the face, back, and shoulders of the fetus and is often most noticeable in infants born prematurely. As the baby matures, lanugo usually begins to shed, and it is common for most of it to be gone by the time of birth, although some newborns may still have patches of lanugo.

In contrast, vernix refers to the protective waxy coating that covers the skin of newborns, while down typically refers to soft feathers found in birds, not relevant to human anatomy. Hair follicles are the microscopic roots from which hair grows, but they do not refer to the fine hair itself. Understanding these terms helps clarify the developmental processes that take place in the womb and shortly after birth.