Board Thread:Spoilers!/@comment-1916997-20150926195527/@comment-24674051-20150928155317

I seem to recall one of the interviews with A & E that indicated that they would be showing Zelena giving Birth during the first half of the season.

From a timing perspective, I think from the time of Robin and Marian/Zelena leaving Storybrooke to when Regina and Emma caught up with them is around 9 weeks.(I think Heart of Gold specifically mentions 9 weeks earlier). From Heart of Gold to Operation Mongoose is about a week  (based on how long Lily was going to hang around). From the End of OPeration Mongoose to the end of Dark Swan is another 6 week interval. So we have 15 weeks total. Assuming Zelena got Pregnant early on during the gap in NYC, She would be just getting to the first part of the second Trimester. There would need to be another gap of 15 weeks to get her far enough along that a premature birth would have a realistic chance of survival (barring the use of some magical deux a machina).

Many of Once's titles have double meanings, though, so there is probably more to it than just a Zelena Reference.