Jimmy Kimmel's baby son had a scheduled and successful heart surgery Monday morning, representatives for the late-night host said.
This is the second surgery Kimmel's 7-month-old has undergone since his birth.
The infant's surgery had been scheduled for November, but was postponed as a precaution after the family came down with colds. (Kimmel continued with plans to take the week off, and had celebrity friends Shaquille O'Neal, Dave Grohl, Channing Tatum and Jennifer Lawrence fill in for him as guest hosts.)
Following the successful surgery Monday, this week's guest hosts include Chris Pratt, Tracee Ellis Ross, Neil Patrick Harris and Melissa McCarthy.
Billy was born last April with heart defects that required surgery immediately after his birth to repair a blocked pulmonary valve, allowing blood to reach his lungs to be reoxygenated.
Doctors usually perform a follow-up procedure after the 6-month-mark. The surgery prevents oxygenated blood intended for the rest of the body from spilling back into the ventricle it just left.
Billy's experience prompted Kimmel to use his show as a platform to advocate for every family's access to equal medical care, including those unable to afford it.
Kimmel and his wife, Molly McNearney, are also parents of daughter Jane, 3.
Contributing: The Associated Press, Jayme Deerwester
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