Conversations with dumb people

I was in a shop yesterday and this is a conversation I had with the sales assistant. I had the wee one with me, Mum had JA.

HER: What a gorgeous baby!!
(No prizes there - he is bew-ti-ful)

ME: Thanks.

HER: How old is he?

ME: He'll be three months on Friday.

HER: God he's big!

ME: Well actually, according to the health nurse he's completely average.

HER: Yeah? What would she know?