Information about stillbirths was obtained from the data we collected at our department and from the Danish Medical Birth Register through record linkage by using the mother’s personal identification number. Information about deaths during the first year of life, including causes of death, was obtained from the Registry of Causes of Death, administered by the Danish National Board of Health, and from the Civil Registration System. Four children who were deceased according to the data from the Civil Registration System were not listed in the Registry of Causes of Death. The information was checked in the children’s medical records, according to which the four children were deceased. Stillbirth was defined as delivery of a dead fetus occurring at 28 completed weeks of gestation or later, and infant death was defined as death of a liveborn infant occurring before age 1 year.