Interagency coordination on behalf of eligible infants and toddlers and their families is a defining feature of Part C of the Individuals with Disabilities Education Act. In the present study, enrollment data for child welfare services and Part C services were examined to assess the degree of overlap between the two service systems. Results indicated that only a small proportion of young children receiving child welfare services also were enrolled in Part C early intervention services. These findings suggest that more effective procedures are needed for identifying the developmental problems of infants and toddlers enrolled in child welfare services and for enrolling them into Part C early intervention services.