Acoustic Properties of Cries in 12-Month Old Infants at High-Risk of Autism Spectrum Disorder.

Researchers recorded the cries of 60 12-month-old baby siblings of children with autism. Half were high-risk; half were low-risk controls.

Each baby cried alone in a quiet room while a camera captured the sound. The team measured how long each cry burst lasted.

High-risk babies produced shorter cry units—about 0.4 seconds on average—than low-risk babies. The shortest cries came from infants later diagnosed with ASD.

The difference was large enough that a simple stopwatch could spot the pattern.

Kaddouri et al. (2025) saw no vocal differences at 9 months in the same high-risk group. The new data suggest the acoustic gap emerges between 9 and 12 months.

Baker et al. (2010) showed adults need extra time to label atypical cries. Shorter bursts may be one reason those cries sound “off” to caregivers.

Toth et al. (2007) already found language and social lags in non-autistic siblings. Adding cry length gives clinicians another quick red flag at the one-year visit.

You already screen 12-month siblings with tools like the FYI. Bring a timer to the assessment. If the baby’s cry bursts are consistently under half a second, flag the file for follow-up. The cost is zero; the potential head start on intervention is huge.