Jimmy Kimmel's wife: 'I want to be the one to tell Billy what his dad did for him'

Molly McNearney opened up in a new interview about why she and Kimmel chose to speak up about their son's heart condition.
3:06 | 12/07/17

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Transcript for Jimmy Kimmel's wife: 'I want to be the one to tell Billy what his dad did for him'
All right, guys. We move on to that passionate message from Jimmy Kimmel's wife Molly mcnearney opening up about their 7-month-old Billy's health battle and how it affected their family. Billy is doing well after another heart surgery this week but it has been an incredibly tough journey, one they hope will help others. Billy was born with a heart disease. Reporter: Jimmy Kimmel breaking down sharing the details of his newborn son's open heart surgery three days after his birth in April. So we put the baby in an ambulance to children's hospital, Los Angeles, and on Monday morning doctor Starns fixed one of the two defects. Reporter: In an he say for "The Hollywood reporter," Molly mcnearney, Kimmel's wife is sharing her version of their son's story. And what it was like to watch her husband pour his heart out. I sobbed through the entire thing. He didn't have to do that. Our family has excellent health care. He had nothing to gain from that. He did it for the other people who we met in that hospital. He came home that night and I just hugged him and I wouldn't let go. If your baby is going to die and it doesn't have to, it shouldn't matter how much money you make. I think that's something that whether you're a Republican or a Democrat or something else, we all agree on that, right? I mean we do. Reporter: I sat down with Kimmel in October. Was there a moment when you decided I'm now going to take something very personal and very real and I'm going to try to change the mood of not only America but our lawmakers. It's not something that I discussed with anyone other than my wife. But I did know that I had to say something. I always try to make something good out of something bad, you know, and in this case I thought, all right, well, what can I do or say that might potentially make some good out of this, maybe make me feel like this happened for a reason. Reporter: Mcnearney writes people were sending letters to our home attacking both of us on Twitter saying things like we deserve this. It's been harder for me to deal with than the weekly cardiologist appointments and making sure my baby is breathing properly. She had to totally stop looking at her mentions on Twitter. That one person who criticized them and accuses them of trying to politicize their kid's illness just shakes her so much that she krantz look at any of comments. Reporter: Now she says she has no regrets sharing the very personal details of her son's health journey with the world writing if we were to do this all over again and someone said, you would have an opportunity to have a perfectly healthy baby boy, I would take the one we got because I think it helped a lot of families and thank god this will, fixes crossed end in a positive way. And Jimmy's guest host last night updating viewers on Billy's condition and says the latest heart surgery was, in fact, a success. His respirator is out and Billy is eating and smiling. Robin. We're so happy to hear about that and thank you, thank you for how they are sharing their story because they are helping other families.

This transcript has been automatically generated and may not be 100% accurate.

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