Vocal patterns in infants with autism spectrum disorder: canonical babbling status and vocalization frequency.

Nixon et al. (2014) watched home videos of babies who were later diagnosed with autism. They counted how often the babies made canonical babbles like "ba-ba" or "da-da" between 9 and 12 months.

They compared these counts to videos of typically developing babies of the same age.

Babies who later got an ASD diagnosis babbled less often and reached the canonical babble stage later than their peers.

The gap was already clear before the first birthday.

Davidovitch et al. (2018) found the same 9-month warning sign, but also showed these babies start to lag on motor items. Together, the studies say "check both language and motor at the 9-month visit."

Laposa et al. (2017) saw a similar pattern using a different sound: babies later diagnosed with ASD produced shorter cry units at 12 months. Different vocal measure, same red flag.

Palomo et al. (2022) used the same home-movie method and age window. They found social orienting was mixed, but name response and joint attention were already weak. Vocal delays plus poor name response give you two easy checklist items for pediatric screenings.

You can spot early signs of ASD without extra tests. While watching a baby play, count canonical babbles and note if the child turns when you call his name. Fewer than two babble types by 9 months, or no name response, deserves a referral. This quick screen costs nothing and fits into any routine visit or parent coaching session.