Baby sleeping

So I know the suggested route of sleep for baby is on his back but my baby refuses to sleep on his back!! I cannot get him to sleep in his bassinet because he doesn't want to stay on his back. I've tried swaddling, bumpers, turning him back to his back. Nothing works. He'd rather sleep on his tummy or on his side. Even when he's napping on me or in his swing he likes to be on his tummy or on his side. I know this isn't "good" for him. So what do I do?