A new policy report from Education Commission of the States provides guidance to state leaders interested in bridging the gaps between programs designed for children from birth to age 5 and programs for Grades K–3. Strengthening the Early Childhood Continuum looks at the efforts of policymakers in five states to create an aligned, high-quality birth to Grade 3 continuum as a way to improve third grade reading and math proficiency. This document identifies lessons learned from the states of Arizona, Colorado, Kentucky, Maine, and Mississippi as they implemented key practices leading to necessary policy changes. The authors address policy changes that were undertaken in the following five areas: third grade reading and math proficiency, teacher and school leader workforce development, preK and K–3 governance, transitions and alignment across the P–3 continuum, and kindergarten. This policy guide also includes a set of guiding questions for leaders of other states to ask and answer as they seek to improve the early childhood education programs in their states.