This may well be a daft question, but HV's scary leaflet waving did a number on me apparently 
My 6mo DD has recently started rolling onto her tummy every time I put her down for a nap. When I put her back onto her back, she rolls back over straight away, and short of sewing Velcro to her sleep suits, I'm stumped.
All the cotdeath leaflets etc said that babies should always sleep on their back, is this the case just for newborns or should I keep trying to get her to stay on her back?
I know I sound a bit PFB, but please be gentle :)