My daughter actually preferred to sleep this way and would constantly roll over. She was always an all over sleeper in her crib lol..now she's a healthy 15 month old~.I think that if a baby is at the age where they have learned how to roll over and that they can roll back, the risk of sids decreases. I have actially read that the sleep positioners can be dangerous..( I  actually read an article in a parenting magazine that was about the dangers of sleep positioners..I can't remember the magazine for the lif eof me though)..I hope you don't worry too much, and I hope this helps!

I think everyone has answered your question.  At 7mths there should be no worries about sleeping on the tummy as long as your baby has good head control.  You baby will wake up and cry or just move around the cot if somthing is wrong. 

My baby hated sleeping on his back always slept on his side from a very young age.  These days he is all over the cot, and likes to sleep on his tummy, bum up LOL. 

Our wee man slept unswaddled from about 6mths, and we had a sound and movement monitor, so I never worried about his position.  He did, and still sleeps all over the cot on his tummy, back, side, however he feels comfortable.  Some of the bits and pieces that you buy to stop movement can actually be dangerous in regard to suffocating.

As everyone else has said, this isn't an issue. Remember a few years ago they actually recommended that babies were placed on their tummies to sleep.

As soon as DS decided to lay on his bellythere was NO looking back at our house. As soon as they can roll around it is safe for t hem to do so.

my bub is a belly sleeper. he slept on his back while swaddled. as soon as we let him sleep unswaddled he slept on his tummy, sometimes he rolls over and sleeps on his back, but the majority of the time he's on his stomach. once they learn to turn their heads to the side and can roll, there's not any danger really, except for loose bedding that they can smother themself with. once they start rolling you can't really stop them flipping over the sleep on their tummy, she obviously finds it more comfortable

I think the only time my older kids slept on their backs was in hospital. As soon as they were home (and even in the hosp) the only way to get some peace was let them sleep on their belly. They were happier that way.

Don't stress about it, she can obviously roll and knows where she is comfortable.

My twins started sleeping on their bellies even younger than 7 months. It just makes them happier. I remember a lot of sleepless nights but once I roll them on their tummies, they stop. Like others said, once they have great head control, it is not AS much of a worry in regards to SIDS. But you can do a few things to lower the risk of SIDS even lower - remove any stuffed animal (or any cloth toys) from the crib and do not use blankets if you can get away with it. Do not have bumpers in the crib, especially since your baby is moving around (besides, there is really no use for it).

Happy sleeping!

Once they are on the move, there really isn't anything you can do to stop them sleeping how they want to sleep.  By this age, the risks of SIDS are not as high as when they are newborns.  by now, they are able to wake up when they find their heads covered and will either 'escape' or scream in panic until you release them.

Once bub can actively roll around there is not much point in forcing them to sleep on their backs. She obviously has good head control and will be able to get herself off her stomach if she needs to.

It's worrying isn't it. I used to go in often and roll my babies back when they were asleep LOL. I just made sure I followed the other SIDS recommendations to help aleviate some of the worry.

Hope this helps