[s1artibartfast]

Fertility treatments have a small impact.

For example, Israel has universal fertility benefiots and this is predicted to contribute ~0.03 TFR. The US and would need a an effect 2,000% (20x) larger to reach replacment. Many EU countries would need an effect 30X stronger.

The bigger challenge is the people wanting to have children in the first place. This is driven by social values, preceived preconditions, and when in life those conditions are met.

I was just hanging out with some friends for the 4th of July. Their immigrant parents chose to have a child while in college working on their Phds and residing in the US on student visas.

I dont know any of my peers that would intentionally make that choice due to the percarious and unstable position.