Family courts are skewed horribly to the women's side. I don't know what you were paying before but if this is additional money for her it is just the kind of thing that really pisses me off. You should have to pay child support but when they expect you to give the woman money too that is ridiculous. She is young and able to work and presumably find some other schlub there is no reason she should live on your dime.
That's why my advice to young men is always the same. Whatever you do, don't ever get married, but if you do don't EVER, EVER, EVER, get divorced.