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 … [Read more...] about About Bayley Scales of Infant Development Scores