The government could require a reversible birth control method the entire time the mother is receiving welfare. Or they could say there will be no monetary increase for breeding multiple children. You will receive the amount to properly feed a single child. Even if you have six from four different men. A time limit of how long an individual can sponge off taxpayers could also be implemented. Say four years maximum and then you are cut off. That is enough time to further an education and make plans to be a contributing member of society. But then the democrats would lose their voter base, the gimme gimme crowd.