Suggestions please.

Does anyone have any idea of a way I can show my fiancé that he isn't ready for us to have a baby. 
He and I are 6 year a part and I'm still in college and not ready to make a leap to having a baby yet. I've told him that but he's not catching on. We currently live 6 hours away from each other which is another reason I don't think it's a good idea.