In the late 70’s they advised parents to not let babies sleep on their tummies. They suggested that in some cases it could interfere with breathing, I believe. I haven’t seen that statistic that the deaths had dropped.
But I can’t even comprehend a parent vaxxing a young child with an experimental toxin.
This happened 10 years ago. Just what experimental toxin migh possibly been involved?
No, it was the opposite. During the 1970s one learned to treat premature babies, and one of thing one learned was that they oxygenated better if they were resting on their stomachs. From this finding pediatricians started to teach parents that their mothers and grandmothers had been all wrong letting their babies sleep on their backs. At about the same time the rate of sudden infant deaths started to increase.
It was not until some 10 - 15 years later a young pediatrician from Australia (IIRC) found evidence that it was the tummy-position that increased th risk for SIDS that the rate slowly started to decrease again. This is a sad story that the medical profession makes its best to try and forget. You have to work hard to find the historical rates of SIDS plotted from the 60s until the present.
This is how it is expressed in modern scientific papers (just one example): "In the majority of the countries, there was a rapid surge in the cases of SIDS in the early 1980s followed by a decline in the 1990s. The main reason for this dramatic deterioration [decline] in the cases was the "Back to Sleep" campaign which was set in motion by the American Academy of Paediatrics in 1994, which raised awareness regarding a healthy sleeping environment [2]."
NB that the reason for the rapid surge in cases is not stated.