There is need for a holistic, comprehensive ECD monitoring system that covers the multiple facets (i.e. education, health, social protection and the social and economical context in which the child is born) of public and private ECD interventions in a country. Such a system is essential for ensuring that all children can reap the benefits of ECD. It serves as a means of support and oversight for monitoring the performance and planning of ECD policies and programmes in developing countries. The paper highlights the importance of comprehensive ECD monitoring for making evidence-based decisions, and discusses practical issues to take into consideration when developing such a system.