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Building understanding of how children say sounds and words
This tool is used to diagnose speech and language delays based on information parents provide about the vocal development of their 6- to 21-month-old children.

VDLA is a web-based vocalization assessment tool.

The tool makes use of a multi-media format, including audio samples, to guide parents through providing highly reliable information about their child’s vocal development.
VDLA is provided by Boys Town National Research Hospital.
About VDLA
If you are interested in learning more about the development of this tool or how to utilize it, please contact

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