This session is designed for clinicians, researchers, and students concerned with understanding and promoting functional motor behavior. The material is appropriate for participants at all levels of instruction. A major challenge for pediatric therapists is to understand how multiple systems—all developing at different rates—come together to produce functional, adaptive behavior. Nonetheless, the common therapeutic approach is to intervene on systems in isolation. This presentation will describe a developmental systems approach to understand and promote motor behavior. We will focus primarily on empirical evidence about the development of postural, visual, and manual skills in typical development, but the concepts and framework serve as a model for understanding disability and intervention. We will illustrate the richness, complexity, and immensity of infant’s everyday natural experiences in their homes and provide descriptions of how experiences from multiple systems serve to facilitate motor behavior. Overall, this session will benefit attendees by broadening and enriching their understanding of the development of motor behavior.