Toddler Developmental Milestones, 12-15: Introduction (3:12); Types of Development (1:00); Cognitive Development (4:28); Language and Communication Development (2:23); Social and Emotional Development (3:08); Physical Development (3:22); Toddler Developmental Milestones, 12-15: Summary (2:48); When the Milestones are Delayed (1:30); Toddler Developmental Milestones, 12-15: Conclusion (2:02); Credits: Toddler Developmental Milestones 12-15 (0:18);