Pete Wentz helped deliver his new baby.

He said: "It was crazy. The doctor was like, 'You're going to help, you're going to deliver this baby.' And I was like, 'Oh my god, I'm not ready.'

"I put on the scrubs and gloves and stuff and did the delivery.

"After the head came out, I was there, you know, and all I could think was, 'Please do not drop this baby.' Newborn babies are super slippery."

However, Pete - who also has five-year-old son Bronx with ex-wife Ashlee Simpson - surprised himself with how well he coped in the delivery room.

He added in a recent interview with DJ Ryan Seacrest: "I was sure that I wasn't gonna be able to handle it. And everyone says when it's your kid, you can, and it's different. And really, that is true. Because when I was down there, it was like this amazing, beautiful thing."

Pete also explained how they chose Saint's name because the baby didn't arrive until after his tour was over/

He said: "I was really sure we were going to have to cancel a show, or that he was going to show up, and he didn't.

"That's why Saint ended up happening, which will only be a problem, I feel, if he actually became a saint. That would be really weird."