IS this safe?

Is it safe for a baby to sleep on their tummy when in a sleeping bag?

i dont see why not, sophie does!!

does she roll over ok if she needs to

I was told it is ok if they roll onto their tummies themselves, soon after my DD#2 discovered how to roll she would roll onto her belly to sleep.

Yes will dd will roll to her belly to sleep now - but hasnt mastered rolling back .
And i have just ordered a sleeping bag for her as he never has any sheets on by a hour or going to bed

We've had to do the same thing - put DD in a sleeping bag as she is houdini and ends up every which way in her cot! Its usually for her late afternoon nap that it doesn't matter whether she is in a bag or not, if she gets onto her tummy she will complain until I flip her back..............just so she can flip herself over again :doh: I am still surprised at how she can still manoeuvre in her bag though - I find her every where facing any direction!! LOL!!

The bag has been great as on a hot day with aircon on it can get quite cool in her room particularly, so it keeps her comfy, not too hot, not too cold so she sleeps well.