Dear colleagues, We are delighted to present the “Children’s development and developmental delays. Principles of early identification” guidebook. This publication is a collaborative effort between the “Arabkir” United Children’s Charitable Foundation and UNICEF Armenia. It is intended for doctors and nurses.    The publication program for this guidebook has been successfully executed with support from the Russian Federation. The training module was approved and endorsed by the Ministry of Health of Armenia.  The guidebook covers children’s developmental milestones, developmental disorders, detailed information on developmental assessments, early intervention strategies, and guidance for engaging with parents and caregivers.   The guidebook is available on the UNICEF Armenia page and “Arabkir” MC-ICAH website.