Board Thread:Spoilers!/@comment-6175354-20140420035659/@comment-6175354-20140424163727

Mewiet wrote: The Aurora idea is really interesting. Could she and Phillip have agreed to sacrifice his heart (Aurora doing the dirty work) to cast the curse for Zelena and in exchange save the life of their baby? Maybe Zelena initially planned to use their baby instead of Snowing's as the final ingredient in her time travel spell and this was their last ditch effort to avoid it? If it was Aurora, who cast the curse.... this could her Aurora's way of redeeming herself to Snow White, for betraying her to the Wicked Witch.

Since Zelena wants the Charmings' baby, the Dark Curse was cast for protection. I think the curse over Storybrooke, is what is preventing Mary Margaret from giving birth. Meaning, Zelena wants the curse to be broken. After all, Mary Margaret is having the baby in Kansas.