With all three of my newborns, I've felt like back sleeping was torture for the baby... they continually wake themselves with that falling/grabbing reflex and sleep hopelessly lightly. So I often side sleep them with sleep positioners. But then I freak out and resolve never to do it again when they manage to roll to their tummies from their sides accidentally. Angelina, my 3 week old, has done this already just by kicking her legs.
We also cosleep some in the beginning if it helps everyone get more sleep.
Is this totally unorthodox? Do you back sleep your babies and not think twice about it? If so, how do you keep them comfortable on their backs?