Abstract
Recent research has greatly expanded our knowledge about the early development of children with autism and related disorders. Familiarity with this literature will improve the ability of professionals to appropriately diagnose and intervene with young children with autism. This article reviews the literature pertaining to the development of children with autism under the age of 3 years. We examine findings on affective development, sensory processing and attention, praxis and imitation, communication, play, and motor features and stereotyped behaviors, and discuss the interrelationships among these different aspects of development. Screening and diagnostic tools with specific applicability to young children with autism are reviewed as well.