ABSTRACT
Pregnancy success rates following assisted reproductive technologies (ART) increased dramatically during the past decade. However, the surge in successful outcomes has been associated with increased numbers of multiple pregnancies; indeed, approximately 33.4% of all pregnancies reported in the USA after ART are multiple1. These pregnancies inherently pose a higher risk to both mother and child compared with singleton pregnancies2. This phenomenon is described in detail in other chapters of this volume. Fortunately, however, the majority of these multiples are twins, and are associated with significantly lower overall risks than are higher-order multiple gestations.
