B.M.
Hi L.,
I too have a 3 1/2 year old and an almost 11 month old. We started talking about strangers just really lightly. Mostly because my son would talk to anyone - asking people what their name is, what they are doing, where they are going. I just started to tell him that it was rude to ask people questions who you don't know. Now, that might get us into trouble later, but for now it works. We told him that he can say hi, but we really shouldn't talk to people at the store, in the street, etc who we didn't know.
We also used this one night while the news was on. There was a story about the little girl Madeline McAnn who was kinapped while on vacation with her parents. We told him the story (any time he sees kids on tv, he is interested) of what happened (not the WHOLE story), just that they were on vacation and she didn't stay with her mommy and daddy and some mean person took her. I wasn't sure if THAT was the right thing to do, but it worked. Whenever we were out in public, he stays with us and doesn't run off.
All this to say is that I would just keep it really light. I wouldn't sit down and say ok, now we are going to talk about strangers . . ."
Its a tough thing to do because we don't want our kids to be fearful, but also not too eager to be friendly to the wrong person.
B.