We've been double swaddling with a Velcro swaddle me blanket underneath and an A&A blanket around that, which seems to keep Lo nice and cozy. However frequently a little after we put her down I look over and the outside blanket has ridden up above her shoulders and is almost covering her mouth. I push it back down bc it looks unsafe. Does this happen to other people? Any way to avoid? She's 3 weeks old and has reasonable head and neck control.