He's 3.4 and I think it started when dd was born and we encouraged him to touch her face gently (as a way of avoiding the over exuberant 2 yr old bashing). Now if he meets a child at the park and gets chatting he invariably ends up stroking their face. Most kids flinch thinking he's going to smack them, I guess. I've tried saying other children don't like it, to no avail. Wondering if I should teach him to touch their arm instead, as may be more socially acceptable.