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How to use the Bayley Scales of Infant and Toddler Development
  1. Chelo Del Rosario1,
  2. Marie Slevin2,
  3. Eleanor J Molloy3,
  4. Jean Quigley1,
  5. Elizabeth Nixon1
  1. 1School of Psychology, Trinity College Dublin, Dublin, Ireland
  2. 2Department of Neonatology, National Maternity Hospital, Dublin, Ireland
  3. 3Department of Paediatrics, Trinity College Dublin, Dublin, Ireland
  1. Correspondence to Chelo Del Rosario, School of Psychology, Trinity College Dublin, Dublin 2, Ireland; delrosac{at}


The Bayley Scales of Infant and Toddler Development—Third Edition (Bayley-III) is a gold standard series of behavioural assessments used by clinicians and researchers to assess the developmental functioning of young children. The rigorous psychometric properties of the tool are attributed to the carefully standardised normative sample and quantitative scoring system. It is a common end-point assessment used in neonatal trials and is routinely used in a clinical setting to assess the development of children at risk of delay. Incidence of developmental delay is higher in clinical populations such as those born preterm or with complications such as neonatal encephalopathy. Early identification of delay is critical as early intervention is most effective in minimising impairment; therefore, routine assessment of developmental outcomes is recommended, particularly among high-risk populations.

  • neurodevelopment
  • child psychology

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  • Contributors EJM conceived the idea for the work. CDR, JQ and EN initially drafted the manuscript, and all authors provided critical revisions of the work. All authors approved final version of work for submission and agree to be accountable for all aspects of the work.

  • Funding This study was funded by Health Research Board.

  • Competing interests None declared.

  • Patient consent for publication Not required.

  • Provenance and peer review Not commissioned; externally peer reviewed.