PinkPalace - I had just posted about this same topic too as DD likes belly sleeping although has been good sleeping on her side this past week or so as her belly pain has been minimal.

I mentioned the "tummy" sleeping at my mothers group and got the worse look from the clinic nurse, and kinda made an example of what not to do for the rest of the group. Having said that though plenty of bub's tummy sleep (as I found out from BB mummies) and so I'm happy with it for DD when she wants to.

I do have an angelcare monitor though for some reassurance. If bubba doesn't breathe for 20 seconds an initial alarm goes on both the nursery monitor - a long beep - (to try to wake bubba and get them breathing again) and also the parent unit, if nothing in a few more second then the full blown alarm sounds constantly on both units to alarm the parents and also to try to alarm the baby. Some hospitals don't recommend them as parents can be blaise (not sure of spelling) about the alarm if it goes off too many times without issue but as long as you treat the alarm as a sign of a problem and not just think (oh it's going off again) then it is worthwhile. Also need to make sure it is setup correctly so you don't get false alarms.

If you don't have one and can't find one to borrow maybe try ebay for a used one. Just a matter of running a test on it when you first get it, put bubba on it, take them off but leave monitor going and it should detect no movement/breathing after 20 seconds, if alarm goes off then the unit should be all ok.