During the day when he's napping I've started putting a rolled up receiving blanket next to him so he can't roll onto his front. Seems to be working so far.
My aunt calls baby-noses "snorkels". They are hard cartilage, and she feels they are made to find air when you think there's no air to find. Picture a baby face smooshed into breasts for milk, with nose-snorkel keeping a small space for air.
For me, if he were mine, I wouldn't see much of a problem.
DS#2 would sleep on his back.
DS#3 who is only 8 weeks old will sleep on his side - for anywhere form 45 minutes to 2 hours or so but if you put him on his stomach (which he will roll to if he is able) will sleep for about 5-7 hours ,you can guess how he usually sleeps
I wouldn't worry too much about it. They say once they can turn over on their own, it is safer. It is a problem when they can't roll themselves over.
Kara, Chad, dd L(5) and ds E(3) and expecting baby E on Valetine's Day ~We are a home-birthing, baby-wearing, home-made, co-sleeping, no-vax, crafting(both of items and of magick!), green living and loving family in Southern NH
Mama to 3 wonderful children