Here’s what I think will happen: Emma will have decided to give up Henry soon after she finds out she’s pregnant. She’s in jail, and has no prospects for when she gets out, so she will feel that giving Henry up for adoption will be “giving him his best shot” a for sure parallel between how Snow and Charming felt putting her in the wardrobe. But maybe she has second thoughts the moment after he’s born, a very common theme especially in tv shows. But, the nurse and/or doctor convince her that’s the right thing to do, and there’s a heartbreaking scene of her letting Henry go. And then we see in Ep9 that the same nurse and doctor are connected to THO, and pass baby Henry on to August/Tink/whoever it is that actually brings him to SB/Gold/Regina. Further confirming that this was a a major ploy to get Henry into the right place at the right time.
I think this is probably spot on.