Turns out that building a society where money and career determines your social status and doing unpaid work like taking care of a family and raising children is not valued at all and even very expensive makes people choose to have less or no children.
In my country the state taxes the shit out of us while pays for the children of non-working people (there’s a shitload of subsidies going into their pockets), so that doesn’t help at all. What people need is money in their pockets, so having a children doesn’t bankrupt a family.