When Lisa Brock, of Lebanon, Pennsylvania, decided to get a breast lift and augmentation one year after delivering her fourth child, she had no idea she was embarking on phase one of her "mommy makeover." She just knew she wanted her old breasts back.

"Before children, I was a full C cup," she says. "After breastfeeding all four kids, I was less than an A. I was a board. I just hung. Even my mother said she'd never seen anyone that needed surgery more than me."

Even though Lisa was only 29 at the time, she had the surgery and was thrilled with the result. Now, the licensed practical nurse, who is 31, has just gone back for more. This time, she had a tummy tuck.

"God forbid I should have lifted up my shirt and let someone see that bump," she says, referring to her sagging stomach, which eight months of steady dieting and daily workouts had done nothing to cure. "It's not fat. It's just loose skin that I have no control over."

Lisa is part of a growing number of women undergoing mommy makeovers—multiple plastic surgery procedures that restore, or improve, their post-pregnancy bodies.

While it's difficult to come by exact numbers for mommy makeovers because it's a marketing term, not a surgical one, Douglas Mackenzie, MD, a board-certified plastic surgeon in Santa Barbara, California, says mothers are by far his largest demographic. He attributes the trend to our obsession with youth as well as the public's acceptance of plastic surgery. Even the numerous television makeover shows, he says, are merely an indication of a boom that began awhile back.

"Unlike our parents generation, [these mothers] want to stay young and feel young and preserve the body they've had," he says. "The music they listen to, the restaurants they go to, the clothes they wear—all have a lot to do with it. It's a new generation."