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Bayley Scales of Infant Development

(bālē)
pl.n.
  1. Standardized tests used to assess the mental, motor, and behavioral progress of children during the first two and one-half years of life.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.