Developmental progress data are reported on 36 Down's syndrome infants and young children who have been involved in an early educational intervention project for between 4 months and 2 years. The project incorporated parent training and home-based instruction as well as center-based instruction. The development of all children was accelerated, with achievements at and above normal levels being attained in several cases. Younger children were particularly advantaged by virtue of entering the project with higher developmental-quotient scores, and they progressed at least as rapidly (in some cases more rapidly) than older children.
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