Board Thread:Character Discussion/@comment-25491743-20150514170205/@comment-26159109-20150514185019

Eskaver wrote: She won't have a miscarriage or they would have let the Author write it out of existence or drop it down a plot hole. I theorized that it is Ozma, given that Zelena still technically rules Oz and has powerful magic.

They won't age it either because they never age anyone unless Zelena has the magical power to age her baby (Rumple mentioned able to turning the clock forward and backwards from kid to adult and vice versa) Except that a miscarriage can have an impact on her character hence character development. Writing it out from existence won't do anything.