DD2 made the decision for us, she is so bad at keeping a dummy in her mouth it was never possible to give her 1 unless we were holding her. She now sucks her thumb in bed as she goes to sleep for a couple of minutes then she stops, she doesn't suck her thumb any other time.

DD1 had a dummy until she was just over 2 we thought it was going to be a big drama taking it away but it wasn't.