H.M.
I have three boys. My first slept on his back, no problem. My last two would not/will not sleep on their backs. So, they both sleep on their tummies and have since birth. I feel very comfortable letting them do that. They sleep well and so do I. I hope this helps. I know the fear of SIDS and sleeping on the tummy, but my mom remembers when I was a baby that they used to say kids should sleep on their tummies. I don't think they really know what causes SIDS. I hope this helps.