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Bayley Scales of Infant and Toddler Development

The Bayley Scales of Infant and Toddler Development (BSID) is an individually administered instrument for assessing the developmental functioning of infants and young children from 1 to 42 months. Its primary purpose is to identify children with developmental delays and to provide information relevant to planning interventions for these children. It consists of the cognitive scale, language scale, and motor scale. It also contains a social-emotional scale and adaptive behavior scale, which can be obtained from a questionnaire completed by the parent or other primary caregiver.

The original BSID was published in 1969 by Nancy Bayley (1899–1994), an American developmental psychologist. The original BSID was derived from a number of infant cognitive and motor development scales. Although it was administered using standard procedures, it was ...

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