Non Vaccine, Tylenol explanations

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Change in diagnosis

More screening

Older parents
While diagnostic changes and screening likely account for almost all of the “rise” in autism, there are a few factors that might have genuinely increased its prevalence. Older parents at childbirth are likely the greatest contributor. The average age of parents in the U.S. at childbirth has risen about five years since the 1970s. Children of older parents are more likely to have genetic mutations, which could result in a developmental disorder.

Increased Survival Rates for Preterm Babies
Thanks to advances in medicine, babies born preterm that would have otherwise passed away can now survive. However, preterm birth is associated with a higher risk of developmental disorders, including autism. Now that more of these babies are living to adulthood, it follows that there will be more people living with autism as well.

Higher Rates of Obesity
Obesity rates in the U.S. have tripled since the 1960s. The weight condition is associated with all sorts of health issues, including autism. Children born to obese parents are more likely to eventually be diagnosed with Autism Spectrum Disorder. Interestingly, the link is far stronger for obese fathers than for obese mothers.