Dyadic Synchrony and Responsiveness Within the Context of Elevated Autism Likelihood: Applying Time-Varying Effect Models.

Researchers watched 12-month-old babies and their parents play. Some babies had a high chance of autism because their older sibling had it. Others had a low chance. The team counted how often parents pointed to share interest, not to get the toy. They tracked kids' vocabulary three years later.

They used fancy math that shows how behaviors change second by second. This let them see if parental pointing at exactly 12 months predicted later words.

Parents who pointed to show, not to ask, at 12 months had kids with bigger vocabularies at 36 months. This worked for every risk group—high, medium, and low. The link stayed strong even after removing other factors.

Steiner et al. (2018) first showed that parents of high-risk babies act more demanding at 12 months. The new study adds: those same parents' pointing style also forecasts later language. Together they say, 'Watch how parents share attention, not just how they respond.'

Chuah et al. (2025) looked at Mandarin-speaking preschoolers with autism and found smaller vocabularies. That sounds opposite, but the kids were older and already diagnosed. Early pointing still helps before diagnosis; later gaps appear after diagnosis.

Mruzek et al. (2019) trained parents to use more back-and-forth play. Kids gained words, but the gains were small. The new study says parents already have a free tool—pointing to share—months before any training starts.

You can coach parents of 12-month-olds to point at airplanes, dogs, and bubbles simply to share the moment. No extra toys or programs needed. This tiny habit may grow vocabulary for every child you see, high risk or not. Add it to your parent education today.