The most common ones you will most likely be after would be the special Pilates socks, maybe some props like hand towels, wristbands, headbands and other clothing pieces. From bigger pieces of equipment you could use in your Pilates workouts, you might want to buy a foam roller.
There are more than 40 different types of congenital heart defects. Little is known about the cause of most of them. There is no known prevention or cure for any of them.