What are "lanugo" and its significance in newborns?

Lanugo refers to the fine, soft hair that covers the body of a fetus, typically developing around the gestational age of 20 weeks. Its presence is significant in assessing fetal development, particularly in determining gestational age and the likelihood of prematurity. In many cases, newborns born prematurely have a higher likelihood of being covered in lanugo because this fine hair helps to protect their delicate skin and provides insulation in the womb. The presence of lanugo at birth can indicate that the infant is not yet fully mature, as full-term infants usually lose this hair before birth or shortly after. Understanding lanugo is important for healthcare providers, as it can help in making clinical judgments regarding the care and needs of newborns.

The other options refer to different concepts that do not accurately represent lanugo or its significance in newborns. The focus on lanugo highlights its role in neonatal assessment and the implications of prematurity in newborn care.