Board Thread:General Discussion/@comment-24304025-20150121190259/@comment-24674051-20150402133318

In those cases, those were all children. Stop and consider that Henry aged as well, and he was living in storybrooke, under the curse (though not affected by it). Also, it appears that Bae did NOT age until he left neverland, meaning that different aging rules apply there (go figure).

Apparently, by the rules we have seen so far, Pregnencies, up to the point of Birth, can be put on hold indefinitely (see Cinderella and Aurora), and once people reach a certain age, their aging can be slowed greatly (more or less depending on the strength of their magical endowment), but the period between Birth and adulthood will occur on its proper schedule.