The reality star, 33, said that having her daughter made it seem like she had two children, as suddenly she had to schedule time for 36-year-old Kanye too.
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She told E! News: "You definitely have to make time for your husband. Once you have a baby, it's like you have two babies automatically because you have to schedule time.
"You have to make time, and I think that's the key to having a really strong relationship and foundation."
Kim even admitted that when she and Kanye have movie nights, if North is sleeping they'll still have her in the room with them.
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She added: "Even if the baby was sleeping, we would put her in a little Moses basket sleeping next to us and we have our movie time.
"You really have to re-prioritise and make sure you make time for everyone. It's a lot of planning [but] we love to spend time together."
Meanwhile Kim recently revealed that 13-month-old North takes after dad Kanye when it comes to a love of performing.
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But she said: "If you ask her to do anything on command - like clap [or] walk – she shuts down.
"She's really sweet. She's a mama's girl. [That's] the phase she's going through right now."