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Bayley Scales of Infant and Toddler Development, Third Edition

Bayley Scales of Infant and Toddler Development, Third Edition
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Examine all the facets of a young child's development

Age Range
1 month - 42 months

30 - 90 minutes
(depending upon the age of the child)

Related Products

Bayley Scales of Infant and Toddler Development, Third Edition (Bayley-III)

N. Bayley

The Bayley Scales of Infant Development (Bayley-III) are recognised internationally as one of the most comprehensive tools to assess children from as young as one month old. With Bayley-III, it is possible to obtain detailed information even from non-verbal children as to their functioning.
Children are assessed in the five key developmental domains of cognition, language, social-emotional, motor and adaptive behaviour. Bayley-III offers significant additions and improvements to the previous editions.

Key features

  • Core battery of five scales: Three scales administered with child interaction; cognitive, motor, language. Two scales   
  •       conducted with parent questionnaires; social-emotional, adaptive behaviour
  • Caregiver Report Form - a template for the examiner to provide scores, information on tests given, how child performed and recommendations
  • Behaviour Observation Inventory - separate scale for validating examiner and parent perceptions of the child’s responses
  • New norms based on 1,700 children stratified according age, based on the 2000 US Census
  • Ideal for team-testing or multi-disciplinary teams where a professional in each area may assess the child
  • Flexible - can administer one or more domain subtests individually
  • Rolling case for ease of travel


  • Social-emotional subtest - Authored by one of the USA’s leading experts in child development, Stanley Greenspan
  • Adaptive Behaviour subtest - Written by ABAS-II authors Patti L Harrison and Thomas Oakland
  • Caregiver Report - With suggestions to help parents plan for their child
  • Growth Scores and Growth Charts - Chart a child’s growth over time
  • Screening Test - A true screener to determine if further testing is indicated


  • Easier to administer, more user-friendly; easy-to-follow record forms, easel-back stimulus book, child-appealing  manipulatives and play-based items to facilitate assessment
  • Easier to determine if child performed the target behaviour Simplified scoring rules
  • Extended floor and ceiling - Clinician can more easily identify lower functioning infants and toddlers 
  • More parent/caregiver involvement - New test items allow for family input
  • Reduced kit weight and size
  • Improved clinical studies - Special data collected and presented on children with high-incidence clinical diagnoses

Link between assessment and intervention

Bayley-III identifies infant and toddler strengths and competencies, as well as their weakness. It also provides a valid and reliable measure of a child’s abilities, in addition to giving comparison data for children with high-incidence clinical diagnoses. Growth scores can be used to chart intervention progress, and it’s useful in programme evaluation, ongoing monitoring of progress and outcome measurement.

Product Items

Manipulative Screener Set 2 Includes Bayley-II Set Of 5 Circles (Group D), Bayley-III Picture Book, Bayley III Wash Cloth - Yellow 50C, Bayley-III Blocks W/Hole Red 4, Bayley-III Blocks Red Set 8, Bayley-III Stepping Path, Bayley-III Story Book, Bayley-II
Item # screener2
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Manipulative Screener Set 1 Includes Bayley-II Set Of 2 Crayons (Group H), Bayley-II Bell (Group G), Bayley-III Spoon, Bayley-III Plastic Glass Clear, Bayley-III Bottle With Lid 33Mm, Bayley-III Oval Shoe Lace, Bayley-III Squeeze Toy, Bayley-III Ziplock B
Item # screener1
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Manipulative Screener Set 3 Includes Bayley-II Comb (Group H), Bayley-III Pencil With Eraser, Bayley-II Car-Green (Bayleyii/Das/Map), Bayley-III Teddybear Small, Bayley-III Bank, Bayley-III Blocks 4 Small/2 Medium Connecting Blocks, Bayley-III Glitter Bra
Item # screener3
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Bayley Kit: Administration & Technical Manuals, 25 Cogn, Lang & Motor Record Forms, Manipulative Set, 25 Social-emotional & Adaptive Behaviour Questionnaires, 25 Caregiver Report Forms and Administ Video in rolling case
Item # MPS021
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Bayley Scales Administration Manual
Item # MPS02-27289
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Bayley Scales Administration Video
Item # MPS02-27609
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Bayley Scales Technical Manual
Item # MPS02-27296
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Bayley Scales Stimulus Book
Item # MPS02-27333
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Bayley Scales Manipulative Set
Item # MPS02-27357
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Bayley Scales Picture Book
Item # MPS02-27340
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Bayley Scales Cognitive Record Forms (Pack of 25)
Item # MPS02-27647
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Bayley Scales Motor Scale Record Forms (Pack of 25)
Item # MPS02-27319
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Bayley Scales Language Record Forms (Pack of 25)
Item # MPS02-27654
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Bayley Cognitive, Language & Motor Record Forms (Pack of 25)
Item # MPS02-27302
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Bayley Scales Social-Emotional & Adaptive Behavior Questionn (Pack of 25)
Item # MPS02-27562
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Bayley Scales Parent Report Forms (Pack of 25)
Item # MPS02-27579
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