Uh, it takes good secure full time jobs with decent benefits to be able to buy homes, loans, have babies, raise families and pay for everything else...
Where do you suggest they get the money to do this, all of which was taken for granted by the "adults" in the late 40s 50s, 60s 70s and part of the 80s?
The Supreme Court has historically officially clarified that Congress is prohibited from laying taxes in the name of state power issues, essentially any issue which Congress cannot justify under its constitutional Article I, Section 8-limited powers.
“Congress is not empowered to tax for those purposes which are within the exclusive province of the States.” —Justice John Marshall, Gibbons v. Ogden, 1824.
So the first thing that taxpayers who would like to have more children need to do tomorrow morning is the following. Taxpayers need to start working with their state lawmakers to permanently stop the corrupt House of Representatives from stealing citizens' money in the form of constitutionally indefensible federal taxes.
In fact, just about the only constitutionally authorized federal government service that citizens might be dealing with on an almost daily basis is the US Mail Service, authorized under the Constitution's Clause 7 of Section 8 of Article I.
Otherwise, most other federal government services are constitutionally indefensible, having been authorized by FDR's misguided activist justices in the 1930s and 40s.