What type of hair is typically softer and finer, commonly found on infants?

Lanugo hair is a type of fine, soft hair that covers the body of a fetus and is typically found on infants at birth. This hair is unpigmented and provides insulation while the fetus is in the womb. It usually shed and replaced by vellus hair or terminal hair as the individual grows.

In the context of the question, lanugo hair is specifically associated with infants rather than other types of hair, which does not share the same characteristics. Terminal hair, for example, is coarser and pigmented, often developing later in life. Vellus hair, while also fine, is more commonly found on various parts of the body in adults, rather than being exclusive to infants. Alopecic hair refers to hair that is absent due to hair loss conditions, and is not relevant to the description of hair found on infants.