Lanugo - new born son

My son have Lanugo at the back of his shoulder.

What is Lanugo??

Lanugo is the first hair produced by the baby's hair follicles. Lanugo is soft and downy like. It appears during pregnancy and begins to fall off before birth. At birth you can sometimes see some spots that still have lanugo. This might be the face, near the side burns or ears. You can also see it on the back and top of the buttocks.