It is not as simple as that. In my country giving birth is free. And you get economic support for every child. For most people it's still an economic burden to some extent, but for the majority it's not something which blocks them from having children. It's more that most families I know are content with having two children. It feels fine to them. But that's the families that do have children. 25% of men in my country never have children. It's not enough. A lot of families need to produce 3 children, and better if there are some with four.. and most people simply don't want that. And that's for the most part not a question of economy.