Same with Raphael's belly-buttoned Adam 'n Eve, yeah?
Yeah, it's an interesting concept to think about.
I would assume that Adam and Eve still had belly buttons even though they never had an umbilical cord attached to them and were never newborn babies.
I make the assumption they had all the characteristics of the generations that came from them. Can I prove that? Nope.
With or without belly buttons I don't know...interesting to think about though.