Bayley Scales of Infant and Toddler Development | Fourth Edition
Bayley-4
The Bayley-4 Scales of Infant and Toddler Development is a comprehensive tool used to identify developmental delays in young children. Bayley™-4 has been culturally adapted and standardised for use in India in six languages: English, Hindi, Kannada, Marathi, Tamil, and Bengali. Guidance on using this test in your telepractice.
Publication date: September 2019
Age range: 16 days to 42 months
Scores/interpretation: Subtest level scaled scores, domain level composite scores, percentile ranks, confidence intervals, developmental age equivalents, and growth scale values
Qualification level: B Additional information
Completion time: 30 to 70 minutes (depending upon age of child)
Administration: Paper-and-pencil; Q-global
Scoring options: Q-global (web-based); Manual
Telepractice: Guidance on using this test in your telepractice
Professionals have relied on the Bayley Scales of Infant and Toddler Development™ for more than 50 years to identify potential delays in children and get interventions in place early on.
Benefits
- Use caregiver responses to support the scoring of certain items.
- Determine the need for further in-depth assessment.
- Administer one or more domain subtests individually.
- Save significant time through shortened adaptive behavior content from Vineland 3.
Features
The new version of the Bayley Scales of Infant and Toddler Development features:
- Digital delivery option via Q-global combines the record form and administration manual, which allows greater flexibility, ease of use and improved accuracy.
- Content updates made based on research and user feedback.
- Updated normative data and clinical studies.
- Includes complimentary Introductory Online Training
Watch this video to learn more about the new features of Bayley-4.
Sample Reports
The following sample reports are available for Bayley-4.
- Bayley-4 Cognitive, Language and Motor Score Report
- Bayley-4 Social-Emotional/Adaptive Behavior Score Report
- Bayley-4 Cognitive, Language, Motor, and Social-Emotional and Adaptive Behavior Scales Score Report
Bayley-4 Training
Bayley-4 Introductory Online Training (Complimentary)
This free training is included with every purchase of a complete Bayley-4 kit.
For Paper Kit Purchases
Access details are provided in the welcome letter included with your physical kit.For Digital Kit Purchases
The welcome letter can be found in the Q-global Resource Library under the Bayley-4 section.
Bayley-4 Online Independent Study Training Program
A comprehensive, self-paced online program offering in-depth instruction on the administration and scoring of the Bayley-4.
Program Includes:
Detailed modules on Bayley-4 administration
Scoring guidelines
Instructional materials and supporting resources
- Item ID: A103000164189
Bayley-4 Training Workshop – Yashoda Hospitals
In collaboration with the Centre of Excellence in Paediatric Neurosciences and Developmental Paediatrics, Pearson is offering an immersive, hands-on training workshop.
Workshop Focus:
Administration, scoring, and interpretation of Bayley-4
Practical applications in clinical settings
Key updates in the latest edition
Developmental Domains Covered:
Cognitive
Language
Motor
Adaptive Behaviour
Social-Emotional
Schedule:
16 May 2025 – 3:00 PM to 5:00 PM (Zoom session)
17 May 2025 – 9:00 AM to 5:00 PM (In-person session)
Venue:
Audi 1, 9th Floor, Yashoda Hospital, Alexander Rd, Kummari Guda, Shivaji Nagar, Secunderabad
Trainer:
Dr. Ravi Shankar Swamy
MBBS, MRCPCH, MD (Research), FRCPCH
Fees:
₹8,000 (including GST)
To Register:
Contact: Dr Ananya [MOT] – 9438460502
Pearson Academy India – Bayley-4 Training (On-Demand via Brainshark)
About Pearson Academy India
Pearson Academy India, the training arm of Pearson Clinical, offers on-demand professional training via the Brainshark platform. These sessions allow participants to learn at their own pace, from anywhere in the world, providing flexibility and access to top-tier educational content.
Key Benefits of On-Demand Training
- Learn from expert professionals in clinical assessment.
- Earn a certificate upon successful completion.
- Upgrade your skills and stay current in your field.
- Save time with self-paced learning.
- Convenient and accessible anytime, anywhere.
- Digital-friendly platform usability.
- 12-month access to the training materials.
Bayley-4 Brainshark Training Curriculum
Training Structure
This 12-hour, self-paced program is structured across six modules. It provides in-depth guidance on:
Test structure and developmental domains.
Subtest-specific administration protocols.
Scoring accuracy and interpretation techniques.
Identification of developmental delays using Bayley-4 scoring profiles.
Participants receive a certificate of completion for each completed module.
Learning Outcomes
By the end of the training, participants will be able to:
Understand and describe the Bayley-4 scales and structure.
Apply general testing and administration guidelines effectively.
Score and interpret subtests across cognitive, language, and motor domains.
Differentiate between score types and use them to identify developmental delays.
Confidently navigate the scoring and reporting features of the Bayley-4 system.
Eligibility Criteria
This training is ideal for professionals involved in developmental assessment of infants and toddlers, including:
Paediatricians and Paediatric Trainees
Neonatologists
Psychiatrists and Psychiatric Trainees
Psychologists
Occupational and Physiotherapists
Speech and Language Therapists
Early Interventionists
Researchers and Social Workers
Course Details
Cost: INR 13,225 + 18% GST
Duration: Approx. 12 hours (self-paced)
Platform: Online
Access Period: 12 months
Credits: APA CEs and NASP CEUs available
Contact for Registration and Queries
📧 dikshita.choudhury@pearson.com
Resources
The following resources are available.
Bayley-4 2023 normative, reliability, and validity information for the Cognitive, Language, and Motor Scales Update
When will materials be updated?
Postpublication research conducted by Pearson on the Bayley-4 and the Bayley-4 Screening Test indicated a need to revise the normative, reliability, and validity information for the Cognitive, Language, and Motor Scales. In response to this Pearson is updating the following materials:
- Bayley-4 Administration Manual will be replaced to provide updated normative tables for the Cognitive, Language, and Motor Scales
- The digital manual was replaced in Q-global on June 28, 2023
- The print manual will ship to customers in July 2023
- The Bayley-4 Technical Manual will be replaced to provide updated reliability and validity tables for the Cognitive, Language, and Motor Scales
- The digital manual was replaced in Q-global on June 28, 2023
- The print manual will ship to customers in July 2023
- Q-global scoring was updated on June 28, 2023 with the new normative data
- Bayley-4 Screening Test Manual will be updated with revised reliability and validity tables
- The digital manual will be replaced in July 2023
- The print manual is not being replaced; instead, updated reliability and validity tables to insert into your manual can be requested by contacting customer support. The updated tables do not impact the use or interpretation of the test and will be corrected at the next reprint.
How will I know if I’m using the correct version?
From July 2023, to ensure you are using the new, updated version(s), please note that the copyright information (found on the second page) now includes the year 2023:
Copyright © 2019/2023 NCS Pearson, Inc. All rights reserved. Portions of this work were previously published.
Normative copyright © 2004, 2016, 2019, 2023 NCS Pearson, Inc.
All rights reserved.
I have not received the new print materials. What can I do?
If you purchased any of the above print materials before July 2023 and have not received an updated manual, please contact:
In the United States
Tel: 800-627-7271 Email: ClinicalCustomerSupport@pearson.com
Kits, components, and pricing
If I have a Bayley-III kit, can I upgrade to Bayley-4? If so, what are the options?
Materials are available to purchase separately; however, it is more expensive to upgrade this way than to purchase a new kit, i.e. the items required to upgrade would be:
- Bayley-4 Administration Manual (paper or digital)
- Bayley-4 Technical Manual (paper or digital)
- Bayley-4 Stimulus Book (paper)
- New Manipulatives (small set of disks (3); cat puzzle; memory cards; ducks; pennies and penny bank; large disks (6); small car)
- For manual administration and scoring:
- Cognitive, Language, and Motor Forms, and Motor Response Booklets (pkg of 25 of each)
- Social-Emotional & Adaptive Behavior Record Forms (pkg 25)
- Caregiver Report (pkg of 25)
- For digital administration and scoring:
- Q-global: Cognitive, Language and Motor administration, scoring & report and Motor Response Booklets
- Q-global: Social-Emotional & Adaptive Behavior administration, scoring and report
The Scoring-Subscriptions provide a digital scoring option for paper-based administration. They allow manual entry of raw data to generate scores and reports.
The Cognitive, Language and Motor Administration, Scoring and Report is used for the on-screen administration of these domains, and is a digital version of the Cognitive, Language, and Motor Record Form. This is for the Examiner to use and complete.
The Social-Emotional & Adaptive Behavior Administration, Scoring and Report is a digital equivalent of the Social-Emotional & Adaptive Behavior record form. This is a caregiver questionnaire which can be emailed to the caregiver with a secure link to complete or can be completed within your office on an internet enabled device.
Content
How do the integrated caregiver questions contribute to the scoring of an item?
For certain questions a caregiver response is possible for scoring the item, see the example below:
Ask caregiver, "When you say the name of a familiar object, does [insert child's name] look at the object you named often, not often, or not at all?"
Score
2 points, Often
1 point, Not often
0 points, Not at all
The Caregiver Question should not be used in every item where it is an option or where a score of '2' is not assigned. The intent of the caregiver questions is not to optimize scores as much as possible. Rather, they are to be used when a response is ambiguous, the child is not cooperative, or if the behavior may have a greater likelihood of occurring in familiar surroundings. Frequent discrepancies between what is observed during testing and the caregiver question responses raises questions regarding the validity of Caregiver Question scores, and clinical judgement should guide interpretation.
Is the Bayley-4 available in Spanish?
At what age is prematurity considered for Bayley-4?
Prematurity is considered 36 weeks 6 days or less gestation. This is what is meant by "36 weeks or less gestation" on page 27 of the Bayley-4 administration manual.
Digital Administration and Scoring
This is possible and depends on how the account is set up. Some Q-global users intentionally set up their accounts so that all their team members can view their examinees as a group (rather than just the ones they have entered). Of course, an account can also be setup so that users can only see their own examinees. This is a choice made when the account is set up.
If an account is set-up so that it is in the same hierarchy as other accounts, then the examinee record can be moved from one account to another for other disciplines to enter and score their section. Examinee records cannot be moved to an account within a separate entity / hierarchy.
Is there any data on differences between administration using paper vs. digital formats?
The digital administration of Bayley-4 is a digital record form, the child does not interact with the administration device (e.g. tablet/laptop), the administration guidelines between paper and digital are the same.
As part of the Bayley-4 validation we conducted a study comparing performance on Bayley-III (paper scoring) and Bayley-4 (digital scoring). The data indicates that the children's performance on the two tests are similar (no significant difference).
How do I administer Bayley-4 digitally?
The digital administration uses Q-global and combines the record form and administration manual for more streamlined administration. It is optimized for the screen-size of a tablet (e.g. iPad) or larger. Although it will work on a smart phone it will not be a good user experience. Q-global can be used on any device that has internet. You cannot use Q-global without internet access.
The Social-Emotional & Adaptive Behavior questionnaires can be administered remotely via a secure email link.
It is recommended to adjust for prematurity up to 24 chronological months, however, the platform will allow you to adjust beyond this age. There is on-screen text advising the recommended ages for adjusting.
Can you pull up the original eval and add to it for re-evals?
Growth Scale Values are included in Bayley-4. These are useful for re-evaluation purposes and are available for both paper and digital administration.
For paper administration statistical significance is also available to evaluate change in Growth Score Values between two administrations.
What happens if your internet connection drops during administration?
Is offline administration available?
Can Bayley-4 be administered remotely via telepractice?
The Social-Emotional & Adaptive Behavior Questionnaire can be administered remotely. Guidance to support telepractice administration of Bayley-4, including the Cognitive, Language and Motor scales is available here
Psychometrics
How are growth scale values reported?
Growth scale values (GSVs) provide a score metric that does not involve age-based comparisons. Their purpose is for tracking performance across repeated test administrations. If a raw score increases upon a repeat administration, the GSV also increases.
The GSVs have a mean of 500 and a SD of 25. Because of their construction, GSVs cannot be meaningfully compared between subtests or subdomains. GSVs enable the measurement of an individual child's progress or improvement in an absolute sense. Although the normative scaled scores provide information about a child relative to his or her peers at a given time and may show little change over time, the GSV can provide an ability to estimate independent of one's peers and can track growth over time.
Do the Bayley-4 norms account for children from culturally and linguistically diverse backgrounds?
The normative sample was aligned with the latest US census data and included children from culturally and linguistically diverse backgrounds including bilingual children.
A Social-Emotional Age Equivalent table is also available in the Q-global Resource Library. For those without access to Q-global, please contact customer support to request a copy.
Training
How do you access complimentary training with new kit purchases?
Please see the welcome letter provided with your kit. Alternately, for digital users, details are available in the Q-global resource library for Bayley-4. You can also view training options under the training tab on the Bayley-4 webpage.
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Qualification Level
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This approval level enables you to buy our assessments requiring A or B qualification levels.
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