Kim Kardashian said her pregnant sister may have to work on her mother's instinct.
"Kourtney was never ever the type that I ever would think would ever want to have kids," the curvy brunette said during an interview on "The Rachel Ray Show" set to air Thursday.
"She owns a kid's clothing store, and if a kid would come in she would be like, 'Where's your mom? You need to go find your mom and come in with her.' She didn't understand it and she wasn't that nurturing."
But now that Kourtney, 30, is pregnant she has "just completely changed," Kim said.
The mom-to-be and boyfriend Scott Disick are expecting to welcome a baby boy sometime this month.
Sister Khloe Kardashian, also interviewed on the day time talk show, said Kourtney planned to breast feed but had a lot of learning to do when it came to parenting.
"Kourtney was like, 'I'm so excited, I don't have to cook for five years!" Khloe said. "And I go, 'What do you mean?' She's like, 'I'm gonna breast feed.' I go, 'For five years?' She has, like, no idea!"