I couldn't see them ever doing a walker baby like that. It would be wild and crazy, but I'm not sure AMC would push that envelop. I think some things are too much for most TV stations, and the mere fact that Judith is still alive lends some truth to that. I don't think Judith survived in the comics, although they did tease her death at the prison escape. If they were going to do a zombie baby like that it would have to be completely off camera I would think, we'd only see the aftermath.
As far as Daryl, no chance he's dead. For one, they're not going to kill him off with some lame shot from a side angle, that's just a tease. Second, he's on the Talking Dead next week. The fact they've announced that ahead of time usually means the actor isn't going anywhere that week....but they could be throwing people off the scent, who knows. Third, I think the writers probably know now that Daryl brings in probably more viewers than any other character on the show, he's the golden goose. They're going to ride that horse as long as Norman Reedus wants to do the show I'd wager, and when he goes they'll do an exceptional send off.