Autism used to be diagnosed around the same age as children being vaccinated, because that's the age the symptoms would typically manifest themselves. Insofar as being noticeable by the medical profession. Because diagnosis usually relies on the social interaction of the baby. It's not like an ailment that you can necessarily spot at birth like Downs Syndrome for example.
That's not a causation, not even a correlation (as I have previously been corrected on.) It's two coinciding events. Like being daytime and eating.
If I am to go by what
@Shadow Wolf has previously stated that diagnosis is being pushed back before children are vaccinated. Which is always good. Get in early and prepare.
I happen to have a severely low functioning autistic cousin. She can't eat, can't talk, can't put on weight etc. I guess it being so severe it was diagnosed quite early for that particular time.
But I'd take that over her dying from Polio any day of the week. And I suspect those who do actually remember Polio,
like some of the older baby boomers (I'm from a generation who literally can't being a Gen Y/Millennial) would be pulling their hair out in frustration over this modern rejection of the vaccine.