My two year old is very confident and outgoing and has started to wander off a little bit on his own e.g going out the garden gate when I'm not looking etc. I have talked to him about not wandering off without me in case he gets lost or falls over but I think I need to get a bit stronger about it. He will understand if I tell him about the whole stranger thing, but I don't want to scare him too much. Can anyone advise when they think is the right time to do this and the best way to tell your child not everyone is nice- I want to be clear but not over the top....