It is an unfortunate fact that all pregnancies do not end with healthy babies and healthy mothers. Families who have experienced an adverse pregnancy outcome require accurate information about the risk of recurrence to plan future childbearing. This article examines the recurrence risk of four complications of pregnancy: gestational diabetes, preterm delivery, stillbirth, and preeclampsia. Combined, these four complications are responsible for approximately 24% of maternal and neonatal morbidity and mortality.