Phonologic abilities of a preschool child with Prader-Willi syndrome.

The case study follows the development of phonologic abilities in a child with Prader-Willi syndrome from age 2:7 to 6:1 during a period in which she was enrolled in language and phonologic remediation. Changes in her phonetic inventory, in the set of phonemes used correctly, and in phonologic processes are described. Although her phonologic system appeared to parallel those of normally developing children in many ways, some unusual sounds and patterns of usage were also seen. Because the effect of the treatment program on the development of her phonologic system cannot be adequately determined, clinicians should use caution when generalizing these results to other children with this syndrome.