Is anyone else letting their babys sleep on tummy? I put him down on his back, but since he started crawling this week he insists to flip him self over. He has been rolling from back to belly since 3 days old and belly to back since 3 weeks old so at this point he's got tons of rolling experience.

Everything I read said at this age said as long as you lay them on their back and they move themselves it's ok, but I still worry.....