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The fuzz with which some babies are born is called lanugo.

During the first and second trimester, the fetus is covered by ‘lanugo hair’ that may stimulate the type C nerve fibers in utero; at this stage of development, these fibers provide our first sensory input.

Like ringed seals, newborn ribbon seals have a coat of lanugo and cannot survive submersion in icy water until after they’ve formed the blubber layer.

Those who have heard of the origin of the Spanish Royal Order of the Golden Fleece know that the word is an enphemism for the lanugo of the Romans.

It is also covered with very fine, downy hair, called lanugo.