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You're going to need a Costco-sized box of tissues for this one.

What started off as Jimmy Kimmel's usual opening monologue quickly turned into an emotionally raw and incredibly personal and touching story about the birth of the late-night host's second child, William John Kimmel.

Kimmel and his wife, Molly McNearney, who is a co-head writer for Jimmy Kimmel Live!, welcomed baby Billy on April 21, 2017. But the couple's celebrations were cut short when just three hours after his birth, Kimmel and McNearney were faced with every new parent's worst nightmare.

A nurse realized something wasn't quite right with baby Billy's vitals. Turns out, Billy was born with a heart disease called tetralogy of Fallot (TOF) with pulmonary atresia, requiring he undergo an immediate and life-threatening operation.

Though Billy's heart can't fully be repaired until he enters his early teens, this first surgery was— thankfully—successful. Kimmel gave a tearful shout-out to the doctors and staff at Children's Hospital Los Angeles for taking Billy under their wing and mending his tiny broken heart.

Kimmel says Billy is progressing just like any other baby: He's eating, sleeping and, of course, guilty of peeing on his mother. 'Atta boy, Billy. Wishing the Kimmels (Jimmy, Molly, big sister Jane and Baby Billy) all the best!

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