Younger siblings of autistic children are at a high likelihood (HL) of autism, language, and/or cognitive delays. Vocal complexity, a continuous measure of the developmental maturity of vocal communication, is facilitated by parent-child interaction and predicts language outcomes. This study examined whether parents' intervention fidelity to…

Few studies examine the effectiveness of community-based early interventions in unselected samples of autistic children, especially those from minoritized backgrounds. These types of studies require attention to strategies for recruitment, retention, data collection, and support for community providers beyond those used in university-based trials.…