Kourtney Gains 10 Lbs Post-Breastfeeding

Kourtney Kardashian has a new fitness battle on her hands. The reality star has packed on the pounds since she stopped breastfeeding son Mason, 16 months.

"Wow. I have gained almost 10 pounds since I stopped breastfeeding," Kardashian, 32, wrote Monday. "Time to step up my workout game & get over to Rite Aid for some Quicktrim!"

Even though the 32-year-old mom credits her son's breastfeeding for helping her lose her baby weight, sister Kim hasn't always been a fan of the practice.

Last June, Kim, 30, came under fire for writing on her Twitter page: "EWW I'm at lunch, the woman at the table next 2 me is breastfeeding her baby with no cover-up!"

She later defended her tweets: "My sister breastfeeds! It's a natural, beautiful thing. But she covers herself [and doesn't do it] with her boobs exposed."

Credit: Us Magazine

Kourtney: Why I Stopped Breast-Feeding

Kourtney Kardashian tells E! Online that she stopped breastfeeding 15-month old son Mason last week.

"It's traumatizing!" said the Kourtney and Kim Take New York star, 31.

Kardashian, who adds she gained five pounds since weaning her babe, said she put it off for as long as possible.

"Everyone would say it's time, it's time," she said. "So I started to stop a little, and then I was like if I'm happy and he's happy."

Finally she let Mason be the one to decide.

"He just stopped asking," said the reality star. "It's really sad, but it's natural."

Credit: E! News / Us Magazine