I thought the baby was like a sling or something, I completely missed the head. and I thought Raiden was Olga's child (from that whole little speech Snake gave to Raiden at the end)(or was he the Boss'). hmmm guess I need to find a synopsis of the game(in full detail) to make sure.

I see how its vamp now to(via bullet-hole in the head); man doesnt he know how to die

and I can see how it could be BB, but I'm not betting on it(althought it would be nice)