Once they're able to roll front to back, though, you don't need to use it anymore.
Sorry hun, i have to disagree here I hate to say Lilli could go back to front, but still i found her face down. Im still not sure if this had anything to do with her passing, but im ot taking the risk this time.

Ren - Ive already bought one for this bubs. Ive reserached just about everything now for safe sleeping, and think this little idea is GREAT!!!! Ill be using it with bubba girl's gro-bags.