Home > Encyclopedia of Children's Health > Bayley Scales of Infant Development

Definition

The Bayley Scales of Infant Development (BSID) measure the mental and motor development and test the behavior of infants from one to 42 months of age.

Purpose

The BSID are used to describe the current developmental functioning of infants and to assist in diagnosis and treatment planning for infants with developmental delays or disabilities. The test is intended to measure a child's level of development in three domains: cognitive, motor, and behavioral.

Cognitive development

Cognition can be defined as a process by which knowledge is gained from perceptions or ideas. Cognitive development refers to how an infant...