I got angry for you while reading this, partly because that's the sort of thing that used to happen to me all of the time when I was younger and looked way young for my age. (Not over kids specifically, as I don't have any. ) I can tell how much you already care about your baby and that you will be a great mother.
I would've been so tempted to go and complain about that to her manager or something (though I probably wouldn't have gone through with it).