1. Play is a main component of infant and toddler programs as it offers unique opportunities for open-ended exploration without rules or outcomes. 2. During play, adults should encourage interactions but also step back to allow self-direction, and provide time, space, materials and problem-solving support. 3. The environment, including group size, age mixtures, and how space is set up, influences play by impacting stimulation levels, protection of youngest children, and opportunities for resolving conflicts.