Examination of Clinical and Assessment Type Differences Between Toddlers with ASD from Multiplex and Simplex Families.

Anbar et al. (2024) followed 14- to 24-month-old toddlers who had an older sibling with autism.

They scored each child’s joint attention and language during play and then tested the same kids again at school age.

The team compared kids from multiplex families (two or more kids with ASD) and simplex families (only one child with ASD).

Early joint attention and language scores lined up in a neat row: lowest in kids later diagnosed with ASD, middle in the broader autism phenotype group, highest in typical kids.

Those toddler scores predicted how well each child used language in real social settings years later.

Rutherford et al. (2007) first showed that joint attention at forecasts pretend play gains; Joshua’s team now stretches the same link all the way to school-age pragmatics.

Barbaro et al. (2013) used missing eye contact and pointing to flag ASD risk by 24 months; Joshua confirms those red flags also map onto long-term communication need.

Lemons et al. (2015) found that “optimal-outcome” youth lose their diagnosis and show normal pragmatics; Joshua’s continuum fills in the middle steps, showing how early JA feeds that endpoint.

You can spot future social-language trouble with a quick joint-attention probe before age two.

Kids who share looks, points, and words early usually need lighter services later; those who don’t will need heavier pragmatics work for years.

Use the toddler JA score to set dose and to sell insurers on early, intensive social-communication therapy.