This article describes The Community Perinatal Care Study, a community-based study of pregnancy support that was conducted in Calgary, Alberta, Canada, between 2001 and 2004. The study was conducted to learn how to improve community-based pregnancy care and to improve prenatal care and healthy births, particularly for women with increased risk factors. A total of 1,737 women participated in one of three groups: (a) current standard of care at maternity clinics, (b) current standard of care plus consultation with a nurse trained to provide prenatal support, or (c) current standard of care plus consultation with the study nurse and a home visitor. Women who received the intervention were more likely to use available resources, such as prenatal or parenting classes, and they received more information about health and prenatal care. However, there were no differences in smoking, alcohol use, prenatal or postpartum depression or anxiety, nor on any measure of birth outcomes. Women who most benefited from the program were first-time parents or had multiple risk factors.