Yep it's fine if they can get there themselves ... Mine sleeps on his front now face down and it's so scary
Fine as long as you lie them down on their back. Mine lasts about 2 mins. She likes to sleep on her face with her bum in the air 😂
At some point they will just sleep however they want. I think if they’re able to roll both ways then you’re fine to leave them to sleep however they’re most comfortable.