Kylie Jenner showed off her flat stomach on social media just seven weeks after giving birth to daughter Stormi.
In a Snapchat video, the Keeping Up with the Kardashians star, 20, seemed triumphant to have so quickly gotten her body back after baby.
But just days before, fans had blasted young mom Jenner for promoting a "dangerous" waist corset training device designed to get trim.
In her latest Saturday, March 24, video, Jenner lifted her black hoodie to reveal her tiny tummy. She stood sideways and zoomed in on her waist so her followers could get a close view of how her body has bounced back.
Just one month after giving birth, Jenner also showed off in a pulled-up black t-shirt and a pair of black string bikini underwear bottoms.
But fans went nuts when Jenner recently revealed that she turned to "waist training" to "snap back" after her pregnancy.
Rapper Travis Scott's baby mama wrote online earlier this week, "My girl @premadonna87 hooked me up with the @waistgangsociety snap back package. #ad waistgang has the BEST quality snap back products."
In the accompanying photo, Jenner was wearing the Postpartum Snapback trainer to squish her waist.
The corsets she promoted claim to hold new mothers' waists in place as they recover from births and slim down the area.
Critics charged that the contraption could damage women's organs and also set unattainable beauty standards.
One person online wrote that Kylie, "*puts on waist trainer only to post a pic and make more money* hey teenage girls from working class families u can look like me if u too buy this trainer and squish ur organs! It will totally work!!"
Another snarked, "Dear Kylie, your body is SUPPOSED to look like it does after giving birth. Stop promoting dangerous weight loss BS!!"
A source told RadarOnline.com that Jenner didn't care about facing flak and told pals that her haters were "just jealous." In fact, Jenner doesn't seem concerned and is reveling in being a new, very slim mom and sharing photos of little Stormi, born on Feb. 1.
She has gushed on social media about the girl, "She looks just like me when I was a baby" and added that she's "still staring at her all day."
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