This report describes effective approaches for enhancing maternal, infant, and family outcomes based on the scientific and systematic assessment of the content of prenatal care conducted by the Public Health Service's Expert Panel on the Content of Prenatal Care. The range of risks, both medical and psychosocial, that the prenatal care provider must consider are reviewed, and the components and delivery of preconception and prenatal care are discussed. The time of delivery of the content of prenatal care is delineated in terms of a recommended series of medical visits from preconception through the 41st week of pregnancy. Prenatal care for at-risk women with medical or psychosocial risk factors is discussed. Also discussed are services in a psychosocial risk program, services to improve health-related behaviors, and services to improve psychological status and social support. A list of references is included with each chapter. Appendixes describe the panel's criteria for evaluating evidence on the effectiveness of prenatal interventions and list components in the content of prenatal care. (BC)