One-year olds sleep a lot. In their "spare time" they figure out how to use over six hundred muscles and embrace the scary task of becoming an individual. Physical, mental, emotional and social development intertwine as toddlers learn to move, think and speak in new ways. Watch our cast of toddlers struggle with the conflict between wanting to be independent and the desire to cling to the security of a parent. Learn about different personality styles and the role of temper tantrums in emotional development.