Tummy sleeper!

Hey fellow moms i have a situation and i'm hoping i can get some advice on it. Recently my almost 5 month old son has been rolling to his tummy to sleep. I move him to his back but this wakes him up and makes for a grumpy baby. He looks so comfy and peaceful that i hate to have to move him. I want him to be safe that is my first concern. So should i keep moving him back to his back when he falls asleep like this or leave him be? Also is there anything i can do from preventing him to roll to his tummy? appreciate any advice on this.

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    About Stacey
    Current: Henrico, Virginia
    Birth: September 17
    On Moms.com since: Apr 2, 2014
    Hi, my name is Stacey and I became a first time Mommy in November 2013 to a beautiful baby boy named Drayken. He was a surprise to his Daddy and i, but he is the best thing that has happened to our lives and has made our lives so much fuller of love.