Can I lay my lo on his tummy

Re

So my lo has been sleeping on his tummy for a week. He can roll both ways very good. When I put him to bed in his crib he took over on to his tummy and goes back to sleep. He seem mad that I even lay him on his back. Some times he cry before going to his back and going back to sleep. So now that he could roll very good can I just put him to bed on his tummy? I know they say not to but is that just tell they can roll on their own?

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