Fingers crossed for you too Katarina.
I wonder if the sisters feel this too. I'm not going to ask mine.

Opt out-they can't compare if you refuse to get involved! Don't be manipulated into playing the game. If you have had it all your life, now would be the time to stop.

Wearyweedy - OMG your post could have been written for me - I am in the exact same position! My sis announced she was PG two weeks ago and I graciously mustered a congratulatory hug but afterwards felt so angry at her for stealing my thunder (i am due to give birth in 5 weeks!) We have been constantly compared all our lives too... me as the clever one and her as the pretty one and when I mentioned my feelings to my parents they shouted at me for being so unreasonable saying that they were highly ashamed of the way I have reacted. I'm not sure if it's pregnancy hormones but I keep having moments of anger towards my sister, followed by guilt that i'm being some kind of irrational cow! But it's reassuring that there are others out there in the same boat. I too, am hoping that the babies will be different sexes...

I would use it to stop comparing. Do not take part. I would get one standard reply such as 'DCs are all different', a witty one would be better if you can think of it,and then never get drawn in. Just trot it out calmly and change the subject.

Thanks for the replies, I didn't realise there was so much of this nonsense about. As for spite / me being competitive - I can't see that at all, I'm not hoping her baby has one leg or something, a baby boy is no less valuable than a girl. Agree the sex might not matter, they will still be compared, but in terms of appearance this sort of thing affects girls more I think.
The bonding with my sister is a lovely thought but pregnancy has just proved to be another area to compete in; I showed her my ultrasound pictures and was told that my baby looks 'like a pig'.
Funily enough I never thought about confronting the family with this comparing business, I'll do that. My hormones should come in handy.
Still got my fingers crossed it is a boy though.

I don't think it will make much difference whether your sister has a girl or boy. Either way, people can choose - or be allowed - to continue their silly comparisons.

You need to decide you are not going to stand for it and slowly evolve your own way of dealing with this for your and your dd's sake.

YANBU - my SIL had twins earlier this year. It turned out that they were born on my DD's birthday. I was really glad they were boys. Twins were always going to be a bit special and they'd stolen the thunder of her birthday so the only thing she has left going for her in the unique stakes is that she's the only girl!

YANBU. I know how you feel.

I am really hoping that karma (or whatever it is) comes into play. I have found that absolutely all of the boastful parents I know have had their come-uppance eventually. Competing about your children is such a waste of time - and if they fail to fulfil their promise the parents get bitter and feel rather foolish. Much better to ignore the whole thing and concentrate on making your children as happy and confident as can be (don't ask me how, I'm still trying to work it out). Good luck with your daughter - she'll be absolutely adorable.

pure spite, I thought so...I am not judging you though

I think a PG is a good opportunity to turn negative feelings for a sibling around. My estranged sister and I bonded over DD....