Board Thread:Off-Topic Fun/@comment-24492600-20140423142149/@comment-4975807-20140501233009

InspiredAndNatural wrote: It is definitely a boy. In one of the pictures, where the baby is nude, one can see in-between its legs an organ that only a baby boy would have.

Edit : I'm talking about the episode "Kansas" by the way

That's incorrect, actually. That promo photo I believe you are talking about shows Mary Margaret holding the baby's leg, and under her hand is David's hand. If you look closely on where David's arm is snaking around to meet Mary Margaret's hand on the baby's leg, you can see his hand is under hers. So the "organ" is David's finger.