Oh Kas, that's really interesting. The swim school we go to uses varying numbers of bubbles to give less/more support and they seem to be taking them off the kids once they can 'swim' without them, or decreasing the number of bubbles bit by bit. Atm Lucy doesn't use anything. One of the reasons for using the back bubbles might be because the kids are in the pool without Mum/Dad once they're confident enough. Who knows. I'm kind of looking forward to Lucy using them 'cause it means she can get the hang of moving around without me propelling her. How did you transition Brad from being held to moving around on his own?