Most atheists are agnostic atheists, aren't they? Certainly the ones I chat to, are. There are gnostic atheists, that is, a 7 on Dawkins' scale, but I don't see all that many of them around.
I think using 'atheist' about a baby is odd, since atheism suggests (to me) that one has thought about it and considered different views. Obviously, a baby hasn't done that, but technically babies are atheists, that is, lacking a belief in God.