What is 90% of Autism Caused By? Understanding Genetics & Development
You’ve probably seen claims that “90% of autism is caused by genetics.” While the exact number shifts across studies, researchers agree on one thing: autism is strongly influenced by genetics, not by anything parents did wrong.
Autism isn’t caused by vaccines, parenting style, or a single environmental trigger. It’s a naturally occurring difference in how the brain develops.
Understanding the Genetic Influence
When people hear “90% genetic,” it can sound like there’s one clear cause. But that’s not how autism works.
Autism is shaped by a combination of many genes, each influencing things like communication, social development, and sensory processing.
Some key points to make this clearer:
- Genetics play the biggest role in autism, according to decades of research
- These genetic differences may be inherited or occur spontaneously during early development
- Autism isn’t based on a single gene — it’s a mix of many factors working together
Environmental factors, such as prenatal development or birth complications, may interact with genetics, but they don’t cause autism on their own. And to be absolutely clear: parenting does not cause autism.
Instead of searching for one “cause,” it’s more helpful to focus on understanding each child’s individual strengths and challenges so they can receive support that feels meaningful and affirming.
At Blue Jay ABA, we focus on supporting children and families—not on trying to assign blame or chase a single cause. Across North Carolina, our team provides personalized ABA therapy that helps children grow in communication, independence, and confidence.
We offer:
- Home-based ABA for learning in a familiar environment
- School-based ABA therapy to support success in the classroom
- Telehealth ABA for flexible, accessible care
We also offer autism evaluation services, ABA assessment, and ABA parent training to guide families every step of the way.
If you’re ready for supportive, compassionate ABA therapy, reach out to us at Blue Jay ABA. We’re here for you.
FAQs
Is autism really 90% genetic?
Autism is highly genetic, but the exact percentage varies by study. It’s influenced by multiple genes, not one single cause.
Can pregnancy factors cause autism?
No single pregnancy factor causes autism. Genetics play the biggest role, with prenatal factors acting only as small influences.
Did I do something to cause my child’s autism?
Absolutely not. Autism isn’t caused by parenting, lifestyle choices, or vaccines.
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