Yeah, a lot of primate babies have very conspicuously colored fur. We call this a natal coat. Howler babies were gold even though the adults had dark brown/reddish fur. Its even more conspicuous in some of the colobines (leaf eating monkeys of Africa and Asia). In some species the babies are bright orange whereas the adults are a drab gray. We're not really sure why such a thing would happen.

Apparently its pretty common, at least in humans of European ancestry, that children are blond but grow up to have much darker coloration. I have read that this also occurs in Australian aboriginal people-- many times children have somewhat blondish hair even though adults have very dark skin and hair.

There is some speculation that this change in coloration throughout human development is akin to a natal coat. Maybe its some kind of mark of immaturity, a signal that the individual needs extra protection, extra care, extra food, whatever. Its speculation, but it makes for interesting talk at anthropology parties.