While the nine-month-old’s face isn't visible in the snapshot, her little legs and feet can be seen. Pictured in her car-seat, North is showcasing sweet grey and white butterfly print leggings and soft grey suede sandals. Khloé captioned the photo, "North West rocking @kardashiankids #AirportSwag."
CLICK ON PHOTOS FOR GALLERY
Kim and Kanye's little girl has been providing inspiration for the range since her arrival last June.
But it was Kourtney Kardashian – mum to Mason, four, and Penelope, 20 months - who was first inspired to expand the family's fashion empire into children's clothing.
"I asked my sisters if they wanted to do it with me when I was pregnant with Penelope," the reality star told E!. "Kim was not pregnant yet, so Kim and Khloé were ok with it as long as I took charge.
Baby North and her cousin Penelope
"My sisters were part of the approval process but as far as the inspiration for the first season, it was just me. Kim was more involved when we got to the summer collection."
The sisters' individual styles have clearly influenced the range. "Khloé is into leopard prints so she picked the prints for the kids line too," Kourtney said. "She is really particular when it comes to leopard!
"Kim now knows the practical side to kids clothing and how it functions, so she was involved equally with me when it comes to picking buttons and snaps, and what we like and don't like.
Sister act: Kim Kardashian, Khloé Kardashian and Kourtney Kardashian
"She has gone through it a little more recently with North, she will remind me of what she loves and what can be annoying."
It's actually not Kourtney's first foray into kids fashion. Along with her mum Kris Jenner, she ran a children's clothing store called Smooch for six years, and did all the buying. And her grandmother had a kids clothing store for over 30 years which she used to work in with her sisters over the summer holidays.
The Kardashian Kids collection
"I've always had a love for kids clothes, but having your own kids is a better education for what is practical," the star confessed. "I used to buy such crazy things for the store that were so much fun, but not the most practical. I am very passionate about this (Kardashian Kids) though and working with kids clothing."