In Sweden, I believe, instead of doing the "back to sleep" campaign they let babes sleep on their tummies and just used organic mattresses/sheets/etc, and had just as good of results reducing SIDS as we did
If you're super worried, will he sleep on his side? DS1 always wanted to sleep on his tummy, but I found that if I nursed him to sleep lying down and then unlatched him and replaced w/ paci, he'd naturally roll onto his back.
GL!