Overnight diaper leaking

My daughter has recently started sleeping threw the night (9-7 or 8 usually). She has also recently discovered sleeping on her tummy as well and that is pretty much the only way she sleeps. But the past few mornings when we get her out of bed her diaper has leaked out the front. The front of her jammie will be wet and her sheet will be wet. Last night we tried upsizing to a size 3 pampers baby dry diaper. We usually use pampers swaddles but these were in the closet from her baby shower. And she still leaked out of it. I don’t want to get her in at habit of me having to hour wake her up in the middle of the night to change her. But I’m not sure what to do. I don’t want her leaking all over every night. Thanks for the help ladies!