The Family Developmental Center is a program of infant day care which during its four years of operation, has provided supportive and educational services for 82 adolescent mothers and their infants in San Francisco. This report describes the organization and development of the nursery facility, with its individualized infant stimulation programs; the weekly involvement of the mothers in the center (including care of their own and other children); parent counseling and parent group meetings; and other supportive services. Mothers accepted in the program had to agree to complete high school or a vocational program. A longitudinal study was conducted with 24 babies from infancy through 24 months of age. Infants in the center appeared to be functioning within the normal range or better in a number of areas of basic developmental importance. Psychological test data on parents indicated that the adolescent mothers had somewhat below average scores on intelligence, but felt competent and capable in their maternal role. Female teachers in the center were found to be confident, dominant, and spontaneous, male teachers more empathetic and affiliative. (GO)