Again, Aquagility, it depends upon whether you tend towards the biblical or evolutionary models! Clearly, the Bible states that Eve was created by God using one of Adam's rib-bones. Thus, she did not come from anyone's womb and so had no umbilicus or, consequently, navel. On the other hand, if she was the first creature to be recognisably a human female as opposed to our apelike predecessors, she had clearly been "born" and not just "made". In that case, she would have had a navel. Once more...take your pick.