My son only slept on his tummy (he's 3 now!) but if a baby won't sleep on their tummy often it's a sign of Dural tension and you should get baby adjusted by a peds chiropractor or get cranial sad earl work done on babes! Makes the difference for all babies!
yeah I have to have a c-section so I usally have the baby sleep with me in the room. but when I get home he will sleep in my room for the first six months.
my daughter only slept on her stomach, she's a year old and will still only sleep that way. But back is supposedly best. I met her lay on her stomach and stuff for play/tummy time as well. if she ever laid on her back I put the boppy pillow underneath her so she could lean up. I didn't like her flat on her back.
I prop mine up with a blanket and lay them on their side so they don't choke on their throw up I think its best for me if my kids sleep on their side but everyones different.
whichever my babe will sleep on. I'm not gonna restrain him to just one side. :)