The purpose of this study is to evaluate the effectiveness of the implementation of a Medicaid managed maternity care program in a public health department service population, analyzing race-specific models of WIC participation and risk of small-for-gestational age of term. There were 13,095 singleton deliveries during the period 1987-1990 to women with prenatal care in this managed maternity care program. The research design entailed comparison of the intervention group (those receiving regular prenatal care plus comprehensive care coordination in 1989-90) with an historical comparison group of women who received only regular prenatal care in the two years (1987-88).