The purpose of this research brief is to examine patterns of primary child care arrangements among infants approximately 9 months of age, comparing those in households at or below 150% of the poverty threshold to those in households above 150% of the poverty threshold. Data from the Early Childhood Longitudinal Study–Birth Cohort (ECLSB) provide a snapshot of patterns in primary child care arrangements using a nationally representative sample of infants born in the United States in 2001.