Sadie Rutenberg is a 3-year-old who likes the color pink and loves penguins. She's happy, spunky and very friendly. But Sadie isn't like most children her age — she was the first child in the United States to receive a revolutionary pediatric mechanical heart valve when she was a baby as part of a clinical trial. Now FDA approved, the dime-sized valve is the world’s smallest, and suitable for treating the tiniest patients including newborns and babies 1-year-old and younger. Before Sadie was born, an ultrasound showed the walls between her heart's left and right chambers were not forming properly. As a newborn, she was diagnosed with a congenital heart problem called complete atrioventricular canal defect. 'Imagine a giant hole in the upstairs chamber of your heart, and a giant hole in the downstairs chamber, so the middle is essentially missing,' explained Dr. Jonathan Chen, who was chief of pediatric cardiovascular surgery and co-director of Seattle Children's Heart Center.