Early recognition of children with autism: a study of first birthday home videotapes.

Researchers watched first-birthday home videos of kids later diagnosed with autism and kids with typical development.

They counted four simple acts: pointing, showing toys, looking at faces, and turning when name was called.

A small group of videos let them test if those four acts could tell who had autism.

Kids who later got an autism label missed most of the four acts on their first birthday.

The four-act checklist correctly picked 91% of both groups — a strong early flag.

No extra gear needed; any home video of the party worked.

Baranek (1999) added odd sensory-motor moves like poor sitting and hand flaps to the same video method. That study pushed detection back to 9 months and still hit 93% accuracy.

Veness et al. (2012) then tracked babies month by month and showed gesture gaps stay the best clue from 12 to 24 months, backing up the 1994 party-video idea with real-world data.

Gordon et al. (2015) linked those early gesture gaps to later ADOS scores and language, proving the birthday signs predict real diagnostic outcomes.

You can coach parents to film any short play routine at 12 months. Score the four acts yourself or train staff; it takes ten minutes. If the child fails two or more, refer for full screening. This low-cost step catches kids before classic red flags show up, giving you a head start on early intervention.