The number of incarcerated women in the U.S. continues to rise. Most are of reproductive age, and at least 5% are pregnant while in custody. Understanding pregnancy outcomes is critical for improving services for women and their families. The only systematic assessments of pregnancy prevalence and births in prisons were done in the 1990s, and did not include miscarriages, abortions, and other vital statistics. A collaboration among academic researchers, an advocacy-based research organization, and national correctional policy groups is underway to establish an ongoing, national reporting system for pregnancy outcomes in corrections. This presentation will describe methods and pilot data of this multi-sector initiative. The approach will provide important data and help other efforts to systematize national data on health outcomes in correctional settings.