This theme newsletter issue presents seven articles describing toddler behavior and development, services for toddlers, and toddlers with special needs. The first article, "Toddlers: Themes and Variations" (Lois Barclay Murphy and Colleen Small) focuses on variations in toddler development, noting emerging skills, language, and the caregiver role. Nina Wallerstein, in "Observations of an Active Toddler," details the activities of one toddler over a typical 45-minute period. "Attachment and Exploration: The Toddler's Dilemma" (Alicia F. Lieberman), considers the toddler's task of balancing between the need for a secure base and his developmental urge to explore and experiment. Abbey Griffin, in "State Regulations Concerning Toddlers in Child Care," reviews and compares relevant state standards. Opportunities for social development in a mixed-age mixed-ability program are described by Nancy Balaban in "Mainstreamed, Mixed-age Groups of Infants and Toddlers at the Bank Street Family Center." Seven phases in the transition to out-of-home care for toddlers with special needs is discussed by Tess Bennett and others in "The Transition Process for Toddlers with Special Needs and Their Families." An article by Sarah Landy and Ray DeV. Peters titled "Understanding and Treating the Hyperaggressive Toddler" describes cases of toddlers with aggressive conduct problems, considers the regulation of affect in toddlers, identifies components of the growth-promoting environment as well as the "circle of rejection," and proposes a model for treating aggressive toddlers and their parents. (DB)