The musician and his model wife Lily Aldridge announced that they were expecting a child in December, and the couple have already starting making the necessary preparations.
He told E!: "We've slapped some paint on the walls, and no shoes in there because we've got white carpet."
Speaking at the Grammy Awards on Sunday, he added: "I'm excited to decorate it with fun little musical posters and things like that."
Followill and Aldridge are even considering song choices for while she is giving birth.
He revealed: "We're trying to pick the music to make the birth go smoothly. I said Queens of the Stone Age, but she's not into it. I want the baby to come out rocking."
> Kings of Leon to begin working on new album in 2012
Watch the Kings of Leon Talihina Sky sound check below: