Peer-reviewed research, summarised in plain language — with the sample size, the method, and the limitations kept in rather than edited out. Every summary carries a visible trust tier, so you always know how solid the ground is.
Joint attention — the ability to share focus on the same object with another person — typically emerges between 9 and 12 months and is one of the earliest and most reliable markers of later language and social development. Multiple meta-analyses confirm that delays in joint attention are among the first detectable signs of autism, and that targeted interventions can meaningfully improve these skills in autistic preschoolers.