I would hate to scare anyone with our experience, but if it can help any baby, then it's worth it.
My 2nd baby stopped breathing in her sleep for the first time when she was 2 months old. She was fortunately sleeping on the breathing monitor (Angelcare) which woke me up. After the first time, it happened again and again and again. Her pead could never say why, but told me to never let her sleep any place other than on her breathing monitor. It would woke me up every time my baby stopped breathing. Every time I picked baby up, she would start breathing again.
My first baby slept on his sides as that was what was recommended at the time. My 2nd baby (the one that stopped breathing) always slept on her back, because when she was born, the medical community started recommending that babies should sleep on their backs. Stupidly, I complied and kept my baby on her back all through the time she stopped breathing.
When she was 18 months old, I was diagnosed with GERD (reflux). At the same time, her 4-year old brother was also diagnosed, so I asked the gastro-enterologist if that could possibly be my 18-month old daughter's problem. He tested her, and lo and behold, her reflux count was sky high!! She was put on medication, and has never stopped breathing again.
Since then, my 3rd and now my 4th babies are all put down on their sides to sleep. My 4th baby throws up allot in her sleep. I would never, ever put her on her back to sleep.
I myself has in the meantime come to realise that I can't sleep on my back when I'm not on my reflux medication. I wake up choking!! I never realised that it was because I have reflux. Me and my oldest 3 children all get silent reflux, meaning we don't throw up at all. Not easily, in any case.
This is our story, I know it's different from what the "experts" recommend. But I guess my little family isn't the usual average reflux people. I dread to think what would've happened to my 2nd baby if she wasn't sleeping on the breathing monitor.