Bayley Scales of Infant and Toddler Development

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Introduction

The Bayley Scales of Infant and Toddler Development (BSID) is designed to assess or monitor very young children at risk of developmental delays or disorders. It provides an indication of the child's current developmental level and can also offer a cautious prognosis regarding expected development. The BSID stands out ast the most frequently utilized instrument for assessing development during the initial two years of a child's life. The current version of the BSID is the third edition.

• Target Audience: children at the age of 16 days - 42 months and 15 days
• Purpose: The primary purpose of the BSID is to evaluate various areas of a child's development to gain insight into their strenghts and potential challenges. The key objectives of using the BSID include:
  • Early identification: detecting developmental delays at an early age, allowing for timely intervention and support.
  • Monitoring progress: assessing developmental progress over time, particulary for children at risk of developmental delays or disorders.
  • Research: providing researches and clinicians with a standardized measure for studying infant and toddler development across different populations.
  • Intervention planning: assisting in the development of targeted intervention plans for children with identified developmental concerns.
  • Outcome measurement: evaluating the effectiveness of interventions or treatments by comparing pre- and post-intervention developmental scores.

The test measures the following domains:

• Cognition
• Language
• Motor skills (Fine and Gross motor skills)
• Socio-emotional behavior
• Adaptive behavior

Clinical utility

Clinical utility of the BSID:

• Time to administer the whole test:
  • Children 0-6 months old: 30 minutes
  • Children 6-12 months old: 50 minutes
  • Children 13 months and above: 90 minutes
• Time to administer only the motor skills:
  • Children 0-6 months old: 10 minutes
  • Children 6-12 months old: 20 minutes
  • Children 13 months and above: 30 minutes
• Test procedure: The BSID is an observation list that must be administered in a specific order.
• Target examiner population: Physical therapists, Occupational therapists, Peadiatricians, Research psychologists.
• Training: In order to administer the test, it is necessary to undergo training.

Technique

The administration process:

• Preparation: before initiating the BSID, the therapist should familiarize themselves with the test components and ensure a suitable testing environment. This includes minimizing distractions and creating a comfortable setting to facilitate the child's engagement.
• Introduction to tasks: begin the assessment by introducing the tasks in a child-friendly manner, fostering a positive and cooperative atmosphere.
• Sequential Task administration: the BSID is structured to be administered in a specific order to maintain consistency and reliability. Follow the sequence of tasks, starting with the age-appropriate entry level.
• Observation and scoring: during task administration, keen observation is essential. Note the child's responses, behaviors and any challenges encountered.
• Collaboration with caregivers: incorporate collaboration with caregivers throughout the assessment process. They can help the child to cooperate.
• Documentation and reporting: accurate documentation, scores, and any noteworthy behaviors is crucial. The therapist should use standardized forms and procedures for consistency.

Scoring

Scores are derived by converting raw scores from completed tasks into scale scores and composite scores. These scores are then utilized to assess the child's performance in relation to norms established based on typically developing children of the same age. The BSID provides four variants of norm-referenced scores:

• Scaled subtest scores (range 1-19)
• Index scores (range: 40-160)
• Percentile scores (range: 0-100)
• Growth scores (range: 200-800)

Evidence

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