It's always been on my mind whether a baby could actually turn into a walker while still in the womb, if it dies for example. I know it sounds crazy, and I haven't read anything like that in the comics, or seen it in the TV series either. Though I know Lori in the TV series worries of it happening. Again, I know it sounds crazy, but imagine the scenario where Rebecca is in labour, and she begins to scream in agony because she feels as though something is going wrong. And you have the choice of actually performing an emergency cesarean? I know, I know, baby's don't have actual teeth at that stage, but it could still be in a frenzy? Anyhow, just a strange theory.