DD was a tummy sleeper from a couple of weeks as well... I could only get 15mins out of her on her back but she has always slept fabulously on her belly. I just made sure her cot was empty and nice and flat. I also used a breathing monitor which helped me for peace of mind because I had the guilts for letting her sleep on her tummy.

My mum said when my sisters and I were babies they were told to put babies to sleep on their bellies, so I guess it can't be too bad?! (well that's what I told myself anyway)