"Obviously I'm in a race to have another, but I don't want to do it while on tour," the singer, 37, tells InStyle for its September issue (on sale Friday). "But I can't wait to get pregnant again. It's so fun and consuming and romantic."
Being a mom already, she admits, means "I definitely don't get enough sleep, but I'd rather spend time with him. I've got this extra-fun, amazing, little guy who just wants to hang out with me."
Before she hits the stage while on tour, Stefani sings Kingston lullabies like "Twinkle, Twinkle, Little Star" as he falls asleep. "But he sings a lot to himself," she says. "He's just getting into music. He does the whole head-bouncing thing."
Kingston's being musical should come as little surprise. His dad is Stefani's husband, rocker Gavin Rossdale. "I love him so much," Stefani says of Kingston. "He's the best thing that has ever happened to me."
And while Stefani may be in a rush to get pregnant again, there's another aspect to life she wishes to put the brakes on: raunch.
"Everyone's in such a rush to show they're sexy," she says. "Anyone can be sexy. We all have the same body parts. It's pretty boring. Life's not so short that you need to give it all away in five seconds. That was never my thing."