What's in a Pronoun?

Lately, I have started to refer to the baby exclusively as a boy.  Partly because I hate referring to him as "it," but mostly because it irritates my wife.  She is convinced (or perhaps just hopeful) that she is having a girl.  So, my incessant insistence that it's a boy grates on her.  I think deep down it's because she's afraid I'm right, but she'd never admit that.

It's not that she wouldn't love to have a boy, nor that I wouldn't love to have a girl, we'd be happy either way.  She is just imagining shopping trips, cooking lessons, and make-up sessions with a little girl dressed up like a princess.  She doesn't realize that I'm going to counteract all of that with tomboy stuff anyway, so it's a moot point!  I am trying not to imagine any of that, because I'd rather just let it come however it may.  But I admit that it is fun to watch her exasperation every time I call the baby "him" or "he."

I even got my brother-in-law and some of the ladies in her women's group doing it now too.  She can't escape it!  If a baby's gender could be decided by pure willpower and osmosis, then it would be a boy simply by his atmosphere.  Sometimes, I think my wife believes that's exactly how it works, despite the scientist in her that knows differently, because she gets on to me to stop telling people that it's a boy.

Now where's the fun in that?!