Maybe try it for day sleeps Marlene, and see if you can see any potential problems? To be honest, at 5 months, I wouldn't be worried - he should be strong enough to get himself out of any difficulty.
Si, would wake hourly to 2 hourly from a very young age, maybe 3 -4 weeks, when on his back, but would sleep much better, either through or with only one feed when on his tummy. Considering he seemed exceptionally strong (pushing up onto arms at about 2 weeks), by a very early age I was sleeping him on his tummy.
He was a really windy baby too, and I think the tummy sleeping may have helped there with pressure or something...who knows. All I know, is that at 8 weeks he was sleeping through on his tummy, but if I tried him on his back we were right back where we started with an unsettled baby. Was a no-brainer for us (after checking that every other SIDS recommendation was followed).
Like I said for Marlene, try a tummy sleep during the day, and watch what happens - if bub gets into any trouble, can they push themselves out? Is there anything that can tangle on them? Is the mattress nice and firm so there's no face smooshing into the mattress?
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