Kylie Jenner Vacays in Miami with Baby Stormi

'Curves are hard,' her sister Kim Kardashian tells her, before singing the praises of Spanx.

Bouncing back after a baby isn't easy for any new mother, even if it's Kylie Jenner.

In a preview for this Sunday's "Keeping Up With The Kardashians," Kylie confides in her sister Kim Kardashian about feeling insecure over her changing body after giving birth to baby Stormi in February. The makeup mogul worries about never fitting into her "favorite" size 25 jeans again and is tasked with parting with some of her most-loved items in her closet. Kim reassures Kylie that she understands the pressure to snap back because "curves are hard."

"Like nothing in my closet fits me," Kylie says in the clip and Kim tells her, "You're looking like really skinny!"

"Thank you, I'm getting rid of stuff that I just feel like's never gonna fit me," Kylie says back. "I know I'm not gonna fit into like a 25 jean ever again and after our shoot, I'm just feeling a little insecure."

"Like my favorite jeans, they're never going to fit me again," she adds.

Kim comforts Kylie and tells her that she understands how the new mom is feeling. As a mother of three -- although her third child was via surrogate -- Kim is a pro at the post-baby snap back and offers some advice to her younger sister.

"I know, curves are hard," Kim says. "It's just figuring it out."

Kylie points out that she feels that there are just some people, like "bodyshamers," that just "don't get it."

"Trust me I get it," Kim reassures her. "But the pressure to snap back like, it took me a good six to eight months. Once I got there, I was like, 'OK I'm never leaving.''

The KKW beauty founder urges Kylie to throw on some shape wear and "get out of the house."

"I never cared for those things," Kylie replies. "Now I get it."

"I know it's really early and Stormi's so little, but you just have to roll with it," Kim tells her sister. "You just have to be confident, get some things that make you feel good about yourself and find your balance."

"Honestly, you do inspire me a lot," Kylie says. "If Kim could do it, I could do it."

"Keeping Up With The Kardashians" airs Sunday night at 9 p.m. on E!

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