The two welcomed daughter North in June of last year and while she is "obsessed" with the little 1-year-old, she's not sure how many she'll have with West.
"I just went to San Diego to give my pregnant sister [Kourtney] a break, I took care of my niece, nephew and my daughter," she said on the "Ellen DeGeneres Show," which airs today. "To bathe them, all three, feed them, get them in their PJ's, down for bed, I was literally crying. So hard, three kids."
So, Kardashian, 33, said she'll try two kids at first and go from there. But she's torn about having just one or two more children. She keeps going back and forth, she said.
"But then again, I have so many siblings and I love it, they are my best friends," she added. "I want that for my kids."
Kardashian said one of the things she's dreading is pregnancy style.
"I had a medically, really tough, challenging pregnancy, but it is so worth it," she said.