As the number of young dual language learners (DLLs) in early care and education (ECE) programs is increasing, it is critical to examine how well measures of the quality of practices in these settings reflect the needs of the diverse groups of children being served. This review of the research literature addressed these questions for ECE settings serving children birth-five: whether quality differs for settings serving high proportions of DLLs compared to typical samples, whether existing quality measures exhibit similar psychometric characteristics and associations with child outcomes in settings serving DLL and non-DLL children, and whether DLL-specific measures perform differently than general measures of quality.