Somebody needs to ask RFK Jr this:

[haele]

74. According to the CDC, in the 1940's:

Around 1940, neo natal (last month third trimester birth) mortality rates were 28.8 per thousand live births with follow-on post-neo natal mortality rates at 2.2 per thousand.
Infant mortality (full term birth to 1 year) mortality rates were 47 per thousand.
That doesn't count third trimester miscarriages; I couldn't find reliable data on that as the contributing factor are much greater, including an increased risk of miscarriage due to previous miscarriages.
The rates of mortality decrease considerably - up to 80% by the 1990's, with the introduction of childhood vaccination and the maturing of the first generation of mothers who were vaccinated (approximately within 10 years - in the 1950's - of certain vaccinations being introduced).

https://www.cdc.gov/mmwr/preview/mmwrhtml/mm5823a4.htm#:~:text=In%20the%20United%20States%2C%20the,1940%20to%206.7%20in%202006.

Haele