When people assume I am a first time mum when I am not. I can tell, they give me a 'look' or if they have kids with them they say 'oh you'll have all this to come soon' and I just think 'no, I have all that already'.
I don't know why it bothers me, it is so irrational, but I just feel so patronised, generally by people who I don't know, or not very well (anyone who knows me know I already have a daughter).
It's irrational, but it pisses me off. There, I've said it