My bub slept in a sleeping bag from 2 weeks. He's been a fantastic sleeper. He's now sleeping with either a sheet or blanket depending on the weather.

I was told by a MCHN that it is not necessary to reposition a bub from their tummy once they can roll comfortably - probably not the case if the bub is wrapped though. If not wrapped & are good rollers they will roll themselves out of danger... that's what I was told.