The Bayley Scales of Infant and Toddler Development are well-known and oft-used developmental assessments for children from 2 to 42 months of age. The primary use for the scales is to determine developmental delays or problems in very early development and provide information for planning interventions for children who may need it. The assessment was developed by Nancy Bayley; the third edition, in use as of 2015, is based on more than 50 years of research and development. The third edition of the Bayley Scales was published by PsychCorp (Pearson) in 2005 and is referred to as the Bayley-III. The Bayley Scales of Infant Development were first published in 1969. In 1993 the second edition was published, known as the Bayley Scales of Infant Development–Second ...

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