Less than two weeks after undergoing major surgery, Carlos Rolon is up and dancing. The 6-year-old and his parents have a lot to celebrate: after four years on the waiting list, Carlos finally has a new heart. "He's doing absolutely amazing, he's strong, definitely a fighter, and he looks great," his mom, Sheena Cossette, told InsideEdition.com. Carlos was born with birth defects that affected the development of his heart. He underwent surgery at Boston Children's Hospital on April 3.