It might surprise you to learn that all states have some form of laws requiring 'child support for a fetus', or more commonly, prenatal child support: https://personhood.org/2020/02/07/america-prenatal-child-sup... In many cases, proof of paternity must be established (though it's hard to argue with that.)

It might also surprise you that these laws tend to be strongly supported by Republicans. For example, this bill cosponsored by all Rs that (failed) to make it enforced Federally: https://www.govtrack.us/congress/bills/116/s3236