That baby will 100% be a newborn. I don’t even know how (just like I don’t get how Robin is now a teen…) but there’s no way A and E aren’t going to have some sort of CS w/infant baby scene after months of listening to certain fans scream at them about such a scene.
Well for all we know there’ll be some convoluted timey wimey reason as to why it’s currently only 2017, and not like 2030. New Enchanted Forest time works faster or the new curse had some time travel effect. lol.