This report presents exploratory impact findings for 3-year-olds from the Head Start CARES demonstration, a large-scale randomized controlled trial implemented in Head Start centers for one academic year across the country. The study was designed primarily to test the effects of the enhancements on 4-year-olds, but it also provides an opportunity to explore their impacts on a limited number of outcomes for 3-year-olds who were in the classrooms that included both 3- and 4-year-olds. Key findings in the study include: (1) The enhancements improved teachers' social-emotional instruction and improved teacher reports of 3-year-olds' social behaviors and closeness with their teachers; (2) The positive impacts of the enhancements as a group seem to be driven primarily by The Incredible Years; and (3) As a group, the enhancements did not affect 3-year-olds' pre-academic skills, as reported by teachers. [For the full report, see ED558517.]