Correct me if I'm wrong but Season 3 ended just before Christmas, correct? If that is the case, then Lizzy is just entering the 3rd Trimester, not the end. We still have plenty of potential time for Lizzy to remain preggers and yet never see Henry born.

If she truly conceived on July 4th her due date should be March 27th (thank you handy online calculator!). When you think about the speed the story moves, we may never get past February. Season 2 spanned just over a month. Season 3 technically covered 4 weeks while skipping over 3 months.

We may want to see the birth, but we may never get there.