Prelinguistic vocal development is "the process by which infants and toddlers produce increasingly more complex, phonetically diverse, and speech-like utterances before they say words on a regular basis" (Ertmer, 2005, p. 85). Research has shown that children with bilateral, moderate-to-profound hearing loss experience delays and deficits in vocal…

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…