Policies to raise birth rates generally work poorly even if well funded. These policies work worse than policies to lower birth rates. If you are trying to persuade me not to have a kid, I gain the state incentive plus the avoid cost of the kid. If you want me to have a kid, you have to pay me the cost of the kid before I have an incentive.
So to use modern USA terms, I might well be looking for 250K to 500K of lifetime incentives before I flipped from "I don't want any kids". On the other hand, 50K so I could go to a more elite college might look like a monsterously large payment for sterilization.