Congenital heart defects (CHD) are conditions present at birth and affect heart structure, function, and manner in which blood flows through the heart and to the rest of the body. The incidence of severe CHD is about 2.5 to 3/1,000 live births. With improvements in cardiac surgical technique and critical care medicine, the vast majority of babies with CHD are expected to survive to school age and beyond. However, these surgical and medical advances are also associated with increased risk for neurodevelopmental morbidity.