Maybe. I’m not sure I believe that. Recall that a greater proportion of births are now coming from poorer people in worse conditions and often worse health to begin with. If you are middle class+, You’re probably at top tier rates competitive with the rest of the world.

Mortality rates are often twice as high for non whites in America likely due to wealth effects.

https://www.kff.org/other/state-indicator/infant-mortality-r...