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| Child Development | 1 |
| Comparative Analysis | 1 |
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| Individual Differences | 1 |
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| American Journal on Mental… | 1 |
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| Steffens, Michele L. | 1 |
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Steffens, Michele L.; And Others – American Journal on Mental Retardation, 1992
The development of early vocalizations was investigated with 13 infants who had Down's syndrome and 27 infants developing normally, at bimonthly intervals from 4 to 18 months of age. Both groups demonstrated increased production of mature syllables over time as well as large variations in vocal development, both within and across groups and across…
Descriptors: Child Development, Comparative Analysis, Downs Syndrome, Individual Differences
