Introduction: The Danish Medical Birth Register has been used extensively in conjunction with other national registers to
examine different aspects of socioeconomic differences in perinatal health outcomes. Here, we review some recent findings.
Research topics: Socioeconomic differences were observed in stillbirth, preterm birth, birthweight, congenital anomalies, and
infant death. The patterns varied according to the health outcome and measure of socioeconomic position, but also according
to the time period and the country under study. Our review also shows how many different strategies have been used to
examine the influence of socioeconomic factors on perinatal health. Conclusion: Danish register data is an invaluable
source of information on socioeconomic differences in perinatal health. Danish registers continue to provide
excellent opportunities for research and surveillance in this area.