A questionable claim. See:
https://www.ined.fr/en/everything_about_population/data/europe-developed-countries/birth-death-infant-mortality/
Part of the reason US infant mortality rates aren't as low as we'd perhaps expect is that mortality rates are higher than average for children with mothers who are Black, American Indian, Alaska Native or Pacific Islander.
https://www.healthsystemtracker.org/chart-collection/infant-mortality-u-s-compare-countries/#item-infant-mortality-rates-are-relatively-high-in-southern-states
