Estimates of school-aged English learners are derived from national counts of children enrolled in school. There is no precise analogue for preschool children, and hence there is no exact nationwide count of this population of children. The number of 3- and 4-year old children enrolled in center-based care is rising, and some center-based programs do track participants by home language status. Presented here are key demographics and practice recommendations for young English learners. The practice recommendations in this report represent some, but not all, of the strategies and practices supported by researchers and practitioners. This report is intended to present a guide to common themes represented in the literature. A note on terminology, and a list of additional resources on the topic which have been identified but not reviewed by NCELA staff are included.