Opportunities for Learning and Social Interaction in Infant Sitting: Effects of Sitting Support, Sitting Skill, and Gross Motor Delay - Kretch, Kari S.; Marcinowski, Emily C.; Hsu, Lin-Ya; Koziol, Natalie A.; Harbourne, Regina T.; Lobo, Michele A.; Dusing, Stacey C. (Developmental Science, 2023)