So my LO loves sleeping on her side at night, she is very picky and only likes to sleep on one side and its also easier for her to suck on her thumb when she is turned sideways. We have been using a sleep positioner since about 6 weeks to keep her on her side so she cannot roll forward, and also so she doesn't end up on her back and wake up. It has worked great up until a few nights ago when I saw her on the monitor sliding down towards the bottom of the crib and the positioner put her in a really akward position with her arms stuck up by her head. I'm really worried now that she is more mobile (15 weeks) that she will roll and turn and it is no longer safe. But the problem is, she doesn't stay on her side when I take it away and ends up waking up on her back. Will it just take her some getting used to not having the support to prop her on her side?