Infant mortality rate is an important medical indicator and is often used for comparing countries with respect to welfare and public health. Among other factors, effective medical technology, better access to pre- and postnatal care for all socioeconomic groups and better nutrition have decreased infant mortality in Austria from about 200 deaths per 1000 live births at the beginning of the 20th century to about 5 deaths per 1000 live births at the end. In this study we present the trends in infant mortality, based on 1,654,519 individual birth records, in Austria since 1984. The infant mortality rate dropped rapidly from about 12 per 1000 live births in 1985 to 4.6 per 1000 live births during the last two years of our study (2001/02). Infant mortality rates stratified by cause of death show somewhat differing trends. In particular, the number of deaths due to peripartal problems decreased as the result of improvements in obstetrics and neonatology, but in 1995 a change in the definition of live birth led to a rise of about 20% in the stillbirth rate. At present, Austria has one of the lowest infant mortality rates of all European countries; however, between 1999 and 2002 the mortality rate has been fairly static. A further reduction in mortality clearly cannot be achieved by advances in medicine alone. It remains a challenge for health politicians, physicians and society at large to reduce the prevalence of well-known risk factors such as alcohol abuse, heavy overweight and smoking during pregnancy.