It's great you're looking into ABA and ESDM therapies! Research shows both can lead to long-term improvements for children with autism, especially when started early.

Specifically, the Early Start Denver Model (ESDM) has shown strong results in boosting cognition, language, and social skills. One study even showed kids receiving ESDM maintained language and IQ gains at age 6! (Source: thetransmitter.org)

On the other hand, Applied Behavior Analysis (ABA) has been found to improve adaptive behavior and IQ, especially with early intensive intervention. However, a recent study suggests that high-intensity ABA (over 20 hours/week) may not always be more effective than moderate levels. (Source: pmc.ncbi.nlm.nih.gov)

Both therapies can be helpful, and it's wonderful you're exploring these options!