The Early Head Start Family and Child Experiences Survey (Baby FACES) is a descriptive study of Early Head Start programs designed to inform policy and practice at both national and local levels. In 2007, the Office of Planning, Research & Evaluation (OPRE) in the Administration for Children and Families (ACF), U.S. Department of Health and Human Services, contracted with Mathematica Policy Research and its partners to implement this longitudinal study in 89 Early Head Start programs around the country. Baby FACES followed two cohorts of children, newborns and 1-year-olds, through their time in Early Head Start. The Newborn Cohort includes pregnant mothers and newborn children (194 are in this group) and the 1-year-old Cohort includes children who were approximately age 1 (782 were aged 10 to 15 months) at study enrollment in 2009. Data collection started in the spring of 2009 and ended for the 1-year-old Cohort in spring 2011 and for the Newborn Cohort in spring 2012, when both cohorts were 3 years of age. This is the third and final report describing the experiences of families and children in Early Head Start. The first report provides in-depth information about the sample design, the measures used, and the baseline findings (Vogel et al. 2011) and the second report describes findings from the second wave of data collection focused primarily on children who were 2 years old in 2010 (1-year-old Cohort only) (Vogel et al. 2015). This report describes the experiences of children in both cohorts through age 3 and focuses on understanding program participation and predictors of participation, service quality and predictors of quality, and associations between receiving services at different levels of intensity and quality and child and family outcomes. (author abstract)