My 16mth ds sleeps curled up on his hands and knees with his bum in the air :lol: (sooo cute) and 1st i would always go in and stretch him out onto his tummy but he would be back in his ball when id check on him again!!
I have tried blankets a few times and all of those time he woke upset tangled up in them, so i'll be sticking to sleep bags for awhile :lol: