Kim admitted that, when she and Kanye welcomed Saint back when North was only two, she did feel a "huge change."
"From one to two felt like going from one to 20," she explained. "That was harder than two to three, for me."
One thing she's excited about when it comes to raising four kids is that it will bring a much-needed balance to the couple's parenting dynamics.
"I feel like four is going to be really even though. Because now it's me with two, like always, and Kanye just has one," Kim said. "So he's like still living his life."
So, in essence, she's just excited that now he will get the chance to experience the same stress and sleep-deprivation as she's been dealing with the whole time.
While she didn't elaborate on which of their kids she spends the most time with and which of them gravitates toward dad, Fallon did ask about a recent Instagram photo Kim posted showing North sitting on Kanye's shoulders and full-on sleeping while resting on the top of his head.
"If you know anything about Kanye, you know that he can fall asleep anywhere," Kim explained. "Like, at a doctor's office, I'm getting a sonogram, he's snoring. Any place I take him, he's snoring. He left me in a restaurant once, in a meeting for him in France [and] he falls asleep at the table. So she definitely is him."