Fostering healthy social and emotional development provides the foundation for school readiness in programs serving infants, toddlers, and their families. In this article, the author explores four key concepts that make the link between social and emotional development and early learning: 1) Cognitive and social-emotional development are interrelated; 2) Relationships facilitate learning; 3) Curriculum is delivered through relationships; and 4) Early childhood programs can best support children by supporting their parents. The article provides strategies for early care and education professionals to create the most effective early care and learning environment for optimal development and school success.