Please have the decency to be explicit about what you are saying. No government, federal or otherwise, has any means to pay for anything. All money comes from taxes. All taxes come from individuals. What you are really saying is "I think all of the taxpaying individuals in the United States should pay for women's maternity leave."
Once you recognize that, I can do no better than quote P.J. O'Rourke: "...remember that all tax revenue is the result of holding a gun to somebody's head.
Not paying taxes is against the law. If you don't pay taxes, you'll be fined. If you don't pay the fine, you'll be jailed. If you try to escape from jail, you'll be shot.
Thus I -- in my role as citizen and voter -- am going to shoot you -- in your role as taxpayer and ripe suck -- if you don't pay your fair share of the national tab.
Therefore, every time the government spends money on anything, you have to ask yourself, "Would I kill my kindly, gray-haired mother for this?"
So, would you kill your mother to pay for someone else's maternity leave?