Available evidence suggests that early language intervention is effective when designed to meet the needs of the individual child. Intervention should begin when risk or predisposing factors so indicate or when significant delays are present. Intervention should respect the child's developmental level in relevant areas and should address…

This bibliographic review aims to present a single comprehensive source of references to facilitate clinical application of data obtained on the vocal activity of normal infants and to facilitate continued research on prelinguistic vocal output. The bibliography cites the published observational, empirical, and theoretical reports that examine the…