Please help! He slept in crib fine when swaddled but now that he can roll over I don't want to swaddle him. He only sleeps in bed next to me or in his rock n play next to the bed. He won't even stay in his rock n play in his crib. He is also getting way too big so the crib would really be preferable. Any advice for keeping crib safe but helping baby feel cozier in there?! Thanks!