This study examined the use of multiple, concurrent, nonparental child-care arrangements among children under 5 with employed mothers in the NICHD Study of Early Child Care and Youth Development (N= 759). Older children, those primarily cared for in informal child care, those living in cohabitating or single-parent households, and those whose mothers were employed for 40 or fewer hours per week were likely to be in multiple arrangements. Higher quality primary child-care and lower maternal satisfaction with primary care predicted the subsequent use of multiple arrangements. Little support for income differences in selection into multiple arrangements was found. Findings highlight the importance of child-care characteristics and structure in child-care choice. Policy implications are discussed.