I want a baby, but bf doesn't.

Je
I kind of want a baby, but my boyfriend doesn't want one yet. I'm 22 and I mean, I still love going out partying and having fun and all. But at the same time, I'm ready to settle down and have a baby. We can't afford  one and I know that but still.
He has 2 boys who live with their mum (his ex). They come over a lot and every time I see them and see how he acts with them... It makes me want a baby more and more... He's such a great father.
So idk what to do... How can I make this feeling go away?