Circumcision rates have gone down quite a bit (in the '60's it was around 90% while today it's only around 60%) while the rate of autism has skyrocketed. So it doesn't make sense that there would be a connection.

You are going to read articles about many various things that "possibly cause autism" the fact is no one knows the cause yet so rumors fly. Boys have been circumcised for centuries if not longer so I it would be difficult if not impossible to prove this. I would put this rumor or theory on the bottom of potential causes. I used to feel guilty every time another theory came out and now have come to the realization that there was nothing I did or didn't do to cause my sons autism You cant control something that the medical community just doesn't have answers to and may never have.

My daughter didn't get autism from a circumcision.

There's a new "such and such correlates with autism" study almost every day (no exaggeration). They are virtually all nonsense. This one is especially likely to be nonsense because there's no plausible mechanism for circumcision to result in autism.

One big problem with correlating stuff with autism is that autism is so diverse (it's really many distinct conditions which somehow interfere with social development) and the diverse underlying conditions of autism will correlate with many confounding factors (parental age, ancestral group, socioeconomics, geography, careers, who knows). So you get a lot of correlations that are not causes.

Correlating with autism to find a cause is like correlating with fever or correlating with intellectual disability; there's too much heterogeneity of cause for it to really make sense.

The evidence is pretty clear that the vast majority of autism is genetic; with some "de novo mutation" (genetic changes that were not present in parents) and many cases that are simply a combination of parental genes. The many "correlates with autism" studies can obscure the fact that the evidence for mostly genetics is quite strong. But the genetics are super diverse, like the genetics of intelligence or personality or facial appearance, they aren't a
one-gene-one-disorder kind of thing.

Proposed causes of autism that relate to the genetic mechanisms are much more plausible than those that don't. An example is that as parents age they are more likely to have de novo mutations, so parental age correlates with autism possibly for that reason.

Genetic does not mean immutable or that context and education don't matter. Skills that don't come easily can often be learned, home and school environments can be well-suited to a person or hostile to them, a person with medical conditions unrelated to autism may be uncomfortable or in pain resulting in lots of behavioral and emotional issues, and on and on.

Upbringing and love and opportunity and teaching really matter. That's where parents can make a difference!

In our case, we had both antibiotics and Tylenol at the same time very early in life. Antibiotics wipes out the gut flora and Tylenol wipes out glutathione which is the body's primary way to detoxify :( antibiotics use could also be a good confounder not studied here.

There are three researchers that have published on Tylenol hypothesis and ASD risk and now three (not two as mentioned before) correlating Tylenol to adverse neuro development outcomes in offspring in three different countries. It took fewer and weaker correlation studies than this to remove aspirin for paediatric use in the 80s, I believe. Unfortunately Tylenol is prescribed instead of ibuprofen despite studies recommending ibuprofen for pediatric use.