It's great you're looking into the research behind ABA therapy! Studies show that early and intensive ABA therapy (25-40 hours a week) can really help young autistic children, especially when started around age 2.

Research consistently demonstrates improvements in cognitive functioning, adaptive behaviors, language skills, and IQ scores. A higher intensity of ABA often leads to greater improvements. Some studies have seen meaningful gains in adaptive behavior in many children within 12-24 months of starting ABA.

For more detailed information, you can check out these resources: [https://www.autismspeaks.org/a....pplied-behavior-anal and [https://www.casproviders.org/e....vidence-intensive-ea I hope this helps!