Shortly after Billy's birth in 2017, Jimmy Kimmel revealed that his son had been born with a rare congenital heart defect and has given updates ever since.
Fifty years ago transplanting a human heart was described as revolutionary and groundbreaking. On Saturday, Stanford Hospital celebrates the 50th anniversary of being the first medical institution in the United States to perform the operation on an adult.
Amari Hall, 16, was nothing but smiles after his successful heart transplant at the University of Maryland Medical Center.
Jimmy Kimmel returns to host "Jimmy Kimmel Live!" on Monday, one week after giving an update about his newborn son.
Both Barack Obama and Hillary Clinton tweeted their support.
During an emotional and heartfelt monologue, Jimmy Kimmel opened up about his new baby boy's birth and health complications.