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About Bayley Scales of Infant Development Scores

Developed by Nancy Bayley and published under a title of the same name, The Bayley Scales of Infant Development (BSID) is a test that measures the cognitive, motor and behavioral development of children ages 1 month to 3 years. Specifically, the test is used to illustrate the standard development of children within this age range and isolate those with disabilities or delays who might benefit from early intervention. Used worldwide, the test is administered by specially trained professionals and takes approximately 45 to 60 minutes to complete.