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An article from last April in JAMA also compared between a no-control cohort and a sibling-control cohort. When a control is there for comparison, the potential correlation goes away meaning it's just as likely any findings are confounded anyway.

There's also a correlation between mothers who breathe air while pregnant and children who develop autism. And sometimes even children who don't!

That was shit, underpowered science that should never have been funded or published. A proper Swedish study of 2.5 million proves, without a doubt, no correlation.

Granting agencies and universities need to get their shit together and teach epidemiologists how to do proper science because at this point, it's pretty close to psychology.

Oh look, bullshit information without a source. Also correlation is not the same as causation. Hopefully this snippet is short enough for you to ingest:

https://www.nature.com/articles/d41586-025-02876-1

The study led by Ahlqvist harnessed data from nearly 2.5 million children born in Sweden between 1995 and 2019 and — from the country’s extensive health records — data on acetaminophen prescriptions during pregnancy and on self-reported use collected by midwives, as well as whether children later received autism diagnoses.

The study showed that around 1.42% of children exposed to acetaminophen during pregnancy were autistic, compared with 1.33% of children who were not exposed ─ a “very small” difference, says Ahlqvist.

The team also compared pairs of siblings (born to the same person), in which one had been exposed to acetaminophen and one had not. Siblings share half of their genome, a similar upbringing and maternal health, so differences in autism are more likely to be due to the drug. Using this method, the researchers found no association between acetaminophen and autism — which supports the idea that links found in other studies could be explained by confounding factors.

A large, high-quality study from Japan of more than 200,000 children — also using sibling comparisons and published this year — found no link between acetaminophen use in pregnancy and autism.

There is a correlation between mothers who take tylenol while pregnant and children who develop autism in some studies.

All people with autism, also had mothers who consumed water during their pregnancy... Did water cause autism?

But it could be just as likely that autism is both hereditary

At this point, it's almost a certainty that this is the case, possibly activated by environmental influences during pregnancy. However, none of the influences have been identified, as there's (Last I looked) about 30 separate DNA sequences that are related to autism in people.

For what it's worth... there's about the same number of DNA sequences involved in someone requiring corrective lenses.