Research has consistently demonstrated that self-regulation is essential for the development and preservation of health and well-being in the early years and across the lifespan. Based on the emerging literature on the important role of self-regulation in promoting healthy child development, policymakers have made efforts to include self-regulation skills in practice and policy documents worldwide. Despite efforts to include self-regulation skills in early years curriculum documents, there is limited understanding by teachers, scholars, and policymakers of what self-regulation is and how best to support it in the day-to-day classroom. This limited understanding is perpetuated by a lack of a unified definition of self-regulation. Thus, it becomes important to examine these efforts in a critical way. In Ontario, where the research was completed, a revised play-based full-day kindergarten program was introduced in 2016. In this research we use a qualitative document analysis approach to compare the conceptualization of self-regulation in Ontario’s revised play-based kindergarten program with theory-driven models of self-regulation from empirical research. Analysis was iterative, and themes emerged based upon a coding scheme developed by the research team. Results suggest that co-regulation has a powerful influence on student learning. In addition, the policy document de-emphasizes behavioral regulation and expands cognitive regulation to include more than inhibitory control. Lastly, the kindergarten program discusses metacognition in relation to the use of language to articulate one’s thinking with little attention to goal-directed behaviors. In this paper, explicit recommendations for policymakers and practitioners are provided to ensure that emerging conceptualizations of self-regulation are promoted in early years curricula. Further, empirical evidence is needed to support why it is necessary to understand emerging conceptualizations of self-regulation and outline implications for current early years curricula.