I would buy an angelcare monitor for peace of mind it monitors breathing/movement. I also would get rid of the positioner as soon as they can move it is more of a hazard than a help. Keep the incline. That actually detered Cooper from completely rolling over. He does it now, but that is b/c he is rolling all over the place. She shouldn’t slide down too far without the positioner, Cooper stays pretty much at the top of his crib as long as he isn’t wiggiling.