Bayley Scales of Infant and Toddler Development™, Fourth Edition (Bayley-4™ Screening Test)

Coming December 2019

Ages / Grades:

1 - 42 months

Administration Format:


Administration Time:

15 to 25 minutes

Scoring Options:


Scores / Interpretation:

  • Cut scores by age for Cognitive

  • Language

  • and Motor Scales



Bayley-4 coming September, 2019!
Bayley-4 Screener coming December, 2019!

Get pre-publication pricing on kits!


  • Bayley-4 Screening Test Kit



    Includes: Screening Test Manual (Technical and Administration), Screening Test Stimulus Book, Screening Test Record Forms (pkg of 25), Screening Test Motor-Response Booklets (pkg of 25), Observation Checklist, Screening Manipulative Kit, and bag.
    Note:  the price shown includes a 10% pre-publication discount available until September, 2019 (regular price is $413.00).


  • Bayley-4 Screening Test Administration and Technical Manual


  • Bayley-4 Screening Test Record Form Set



    Screening Test Forms (pkg of 25), and Screening Test Motor-Response Booklets (pkg of 25)

  • Bayley-4 Screening Test Record Form



    (pkg of 25)

  • Bayley-4 Screening Test Motor- Response Booklet



    (pkg of 25)

  • Bayley-4 Screening Test Observation Checklist



  • Bayley-4 Screening Test Manipulative Set and Bag



  • Bayley-4 Screening Test Stimulus Book



Upcoming Live Webinars:

Bayley-4 Overview Webinar

This webinar will familiarize participants with the administration, scoring, and interpretation of the Bayley Scales of Infant and Toddler Development – Fourth Edition (Bayley-4).

Participants will learn about the key updates to the fourth edition including the optional digital administration. Administration for items on the Cognitive, Language, and Motor scales of the Bayley-4 will be presented with an emphasis on new items and item modifications. Participants will learn about the new Caregiver Questions and changes to Item Scoring in the fourth edition.

The options for administration of the Bayley-4 Adaptive and Social-Emotional areas will also be described. Lastly, participants will learn about the scores obtained and basic interpretation of the Bayley-4.


Date:  Tuesday, July 23, 2019 | Time:  1:00 - 1:45 PM EDT

Date:  Monday, August 19, 2019 | Time:  12:00 - 12:45 PM EDT

Date:  Tuesday, September 17, 2019 | Time:  1:00 - 2:00 PM EDT


Clinical Validity of Bayley-4: Comparison of Clinical Groups & Matched Controls

A primary purpose of the Bayley-4 is to identify infants and toddlers who have delays in development.  One way to verify the validity of the new test for this purpose is to compare children from at-risk groups to matched controls to determine if there are differences in scores. Infants and toddlers from specifically defined risk groups were included in the Bayley-4 validity studies (for example: children with Autism Spectrum Disorder; Language Delay; Developmental Delay; Motor Impairment; Prenatal Drug/Alcohol Exposure; Moderately or Late Preterm (32-36 weeks); and Extremely or Very Preterm (<32 weeks)).  Children from these risk groups were compared on all the Bayley-4 subscales.


Date:  Wednesday, August 21, 2019 | Time:  11:00 AM - 12:00 PM EDT


Rationale for Caregiver Report, Polytomous Scoring & Other Innovations on Bayley-4

This session will focus on the theoretical foundations of Bayley-4, and rationale for new concepts introduced to further refine its main purpose of identifying developmental delays.


Date:  Wednesday, September 25, 2019 | Time:  11:00 AM - 12:00 PM EDT


On-demand Recorded Webinar:

Introducing the Bayley-4

Presented by:  Gloria Maccow, PhD

Recorded: February, 2019

» View now (13 minutes)


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