Safe Sleeping?

DS is 4 months old tomorrow and for the past 4 days has been rolling from back to tummy VERY confidently! He does it all the time when I put him on his back on the floor and now he's doing it in bed too. Right then I checked him in his sleep and he is on his side but I know he will end up on his tummy. He is still wrapped though does break out of them now too.

Should I be doing something to prevent him from rolling in his cot?
Should I stop wrapping him?

Anything else I should know?? Thanks!

My book says to stop wrapping when they can roll onto their tummy, so that they can use their arms to lift themselves etc if they get their little faces in the bedding etc for safety reasons. If he uses this as his sleeping cue though you might want to do it gradually, wrap him with one arm out for a few sleeps then the other then just under his arms then off altogether, maybe with a sleeping bag instead if you don't use a sheet? HTH.