I've been stewing on this, which is obviously Not Good. So please help me sort out what to do.
DD has just started school. It's no secret that she's adopted, as DS was already at school when she was placed with us, so one day I just turned up at the school gates with another child. 
I had a short chat with DD's teacher before she started about adoption, partly to make sure she was aware in case any of the work plans needed tweaking (eg family tree project). I said DD was aware, and it wasn't a secret.
However I was rather taken aback when DD's teacher introduced me to a parent of a boy in DD's class who is also adopted, and she had already told this other parent about DD.
On one hand how lovely to make the connection and put us in touch, and lovely for DD to have a friend who is also adopted. But how dare she tell other parents about DD and apply some kind of label to DD and the other little boy. Humph.
I'm over thinking this, aren't I?