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J Autism Dev Disord. 2007 Jan;37(1):158-70. Epub 2006 Dec 27.

Variation in vocal-motor development in infant siblings of children with autism.

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Department of Psychology, University of Pittsburgh, 3415 Sennott Square, 210 S. Bouquet Street, Pittsburgh, PA, 15260, USA.


In this study we examined early motor, vocal, and communicative development in a group of younger siblings of children diagnosed with autism (Infant Siblings). Infant Siblings and no-risk comparison later-born infants were videotaped at home with a primary caregiver each month from 5 to 14 months, with follow-up at 18 months. As a group, Infant Siblings were delayed in the onset of early developmental milestones and spent significantly less time in a greater number of postures, suggestive of relative postural instability. In addition, they demonstrated attenuated patterns of change in rhythmic arm activity around the time of reduplicated babble onset; and they were highly likely to exhibit delayed language development at 18 months.

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