Surveillance of congenital malformations in infants conceived through assisted reproductive technology or other fertility treatments.

Background: As assisted reproductive technology (ART) becomes more common, it is important to understand the associated risks. The objective of this study was to determine if congenital malformations are associated with ART or other fertility treatments in New York.

Methods: In a retrospective cohort study of all live births in upstate New York from 1997 to 2005, exposure was defined using ART or other fertility treatments as noted on birth certificates.