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