Programmes based on early childhood development (ECD) services play a vital role in improving child health and developmental outcomes. Across many countries, these programmes target children under 5 years of age—including those who are healthy, at risk or with developmental disorders—and are implemented in governmental and non-governmental organisations in both the health and non-health sectors globally. This protocol outlines a scoping review designed to systematically map and synthesise existing evidence on the components, implementation strategies and delivery mechanisms of ECD services worldwide. The review aims to inform the development of optimised and comprehensive interventions that support holistic child development.

This review will be conducted by Arksey and O’Malley’s framework and its recent advances. Several databases, including PubMed/MEDLINE, Scopus, Science Direct and Web of Science, Scientific Information Database, Magiran, IranMedex and Barakat knowledge network system, will be initially searched for studies up to December 2024. All searches will be done for published or unpublished articles/reports without time and language restrictions. Two researchers will independently carry out screening of the included studies and extraction of data. Any discrepancies will be resolved by consensus. In case no initial consensus is reached, a third researcher will be consulted to make a decision. The findings will be synthesised through the content-analysis method.

The findings of this review may offer a novel perspective for developing a comprehensive package of ECD services within the Iranian health system. Furthermore, it provides a detailed roadmap for researchers and stakeholders aiming to enhance child health and prevent developmental disorders. This study received ethical approval from Tabriz University of Medical Sciences (ID: IR.TBZMED.REC.1404.139), with no ethical concerns as it involves no patient participation or interventions.