This paper provides a comprehensive overview of key aspects of children's right to education, with a focus on early childhood education and associated challenges and practices. The introduction discusses the theoretical framework of the right to education, including its definition, significance, and international human rights context. Special attention is given to the 4-A model of the right to education (Availability, Accessibility, Acceptability, and Adaptability) and the challenges and practices in monitoring and evaluating the quality of early childhood education. The paper analyzes the impact of socioeconomic factors on education quality, exploring how socioeconomic background and inequalities in access can affect educational outcomes and evaluation. Innovative approaches such as digital solutions, personalized assessments, and holistic evaluations are also discussed. Furthermore, the paper examines international standards and documents related to early childhood education, the legal framework and policies in Croatia, and the implementation of children's right to education before starting school. Finally, the research methodology is presented, including objectives, research problems, instruments, sample, and results of curriculum analysis.