This study addresses seven components of Public Law 99-457 which relate to mental health intervention to meet the comprehensive early needs of infants and toddlers with, or at risk for, disabilities. The seven components include: the definition of "developmentally delayed"; multidisciplinary evaluation; the individualized family service plan, including case management services; a comprehensive Child Find system; a public awareness program; a central resource directory; and personnel development and standards for training. The study focused on three states' efforts to incorporate a mental health perspective into their overall philosophy and service delivery systems for young children. It examined various systems that were in place or were evolving for children and the role of mental health in those systems. Each of the three states has its own pattern of providing mental health services: Maine has a state-driven system of service delivery; Ohio has a strong system of local control; and North Carolina has a blended state and local system. Appendices contain case vignettes of three families with young children and a copy of the instrument used in the study. (JDD)