Bayley Scales of Infant Development (BSID)

Title of Assessment 

• Bayley Scale of Infant Development (BSID)

Author(s) 

•  Nancy Bayley

Year of Publication/Publisher 

• 2019

• Pearson

Identify Type of Assessment 

•  norm-referenced

• standardized

• observation-based

Cost (identify source) & How to Access Assessment (include link if possible) 

•  $1391.50 for complete printed kit

• Bayley-4 - Bayley Scales of Infant and Toddler Development | Fourth Edition | Pearson Assessments US 

Population (who it is appropriate for [age, diagnosis, etc.])  

• 16 days to 42 months

• IDD

• autism

• congenital muscular dystrophy (CMD)

• Cerebral Palsy

• Stroke

• TBI

• SCI

Appropriate Settings (potential practice settings appropriate to administer assessment in) 

•  school-based

• early intervention (EI)

• outpatient/inpatient OT

• home health 

Purpose of Assessment & Function(s)/Area(s) Assessed  

• The purpose of BSID is to identify any delay a child may have in development and to further provide information for intervention planning and other health care providers. The Cognitive subscale assesses cognitive processing such as sensorimotor development and memory. The language subscale assesses receptive communication (understanding and identifying) and expressive communication (output of a message). The motor scale assesses fine motor and gross motor. The social-emotional subscale assesses milestones in skills such as emotional regulation and establishing relationships. The final subscale is adaptive behavior and it assesses communication, health and safety, leisure skills, home living, and socialization. 

Administration (time to administer, group/individual, if there are subtests, can they be completed individually, are there specific instructions to ensure standardization, etc.) 

•  30-70 minutes

• There are 5 subtests:

  • cognitive scale

    • 81 items

  • language scale (expressive and receptive communication)

    • 79 items

  • motor scale (fine and gross)

    • 104 items

  • social-emotional scale (social-emotional and social-emotional sensory processing)

    • 35 items

  • adaptive behavior scale (communications, daily living skills, socializations)

    • 120 items

• The first three subscales listed above must be administered in person at a table and on the floor, but social-emotional and adaptive behaviors can be done via telehealth.

User Qualifications  

• reading the article and manual

• Master's or Doctorate level degree with pediatric training 

Materials Required  

• Manual for instructions and scoring

• stimulus book

• motor-response book

• cognitive, language, and motor record forms

• social-emotional and adaptive-behavior questionnaires

• observational checklist

• caregiver report forms

• proprietary manipulatives set

Scoring Procedure (how is assessment scored and what does score indicate)  

•  Items are scored on a scale of 0 to 2. 0= not present, 1= emerging, and 2= mastery

• In each subtest the items will be ordered ranging in difficulty. Each item has a description with a number, title, where the child's position is, materials, number of trials, and time. The scoring descriptions follow the item description and will then be scored on the above listed scale of 0-2.

Psychometrics/Standardization (norms, reliability/validity studies) 

• Internal consistency ranges from .85 to .99 

• test-retest reliability ranges from .72 to .87

• interrater reliability ranges from .67 to .81 

Strengths & Weaknesses of Assessment  

•    strengths

  • Very good reliability and psychometrics

  • Can be used for many different diagnoses

  • caregivers can be involved in administration 

•  weaknesses

  •  expensive

  • can take a long time to administer

References 

• Balasundaram, P. & Avulakunta, I.D. (2022). Bayley scales of infant and toddler development. StatPearls Publishing, 2024 Jan-. https://www.ncbi.nlm.nih.gov/books/NBK567715/

• Bayley scales of Infant and Toddler Development: Fourth edition. Bayley-4 - Bayley Scales of Infant and Toddler Development | Fourth Edition | Pearson Assessments US. (n.d.). https://www.pearsonassessments.com/store/usassessments/en/Store/Professional-Assessments/Cognition-%26-Neuro/Bayley-Scales-of-Infant-and-Toddler-Development-%7C-Fourth-Edition/p/100001996.html#

• Bayley scales of Infant and Toddler Development, Fourth edition. Shirley Ryan AbilityLab. (n.d.-b). https://www.sralab.org/rehabilitation-measures/bayley-scales-infant-and-toddler-development-fourth-edition