If you remember in one of the first versions, you couldn't have another baby until after the newest one was 3 or 4. I wonder if this was intentional so that you didn't have all your babies back to back leaving mom and pop to wander around all by themselves for a few years before you could start another generation.

Kinda makes a good argument for waiting a few years between kids! Poor mom and pop look so lost without their little family there.