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Sibling rivalries have been happening since, well, forever. Whether they stem from parental attention or jealousy, they can last anywhere from a few hours to an entire lifetime.

One of the most common and early types of rivalries is the jealousy between firstborns and the next child. Easing in one’s eldest child to being a big brother or sister can be, at best, difficult and, at worst, a continuous challenge.

In most families’ experiences, the initial pushback from firstborns is normally just a phase, but that has not been the case for “Keeping Up with the Kardashians” star Kim Kardashian.

She gave birth to her first child, North, with husband Kanye West in June 2013. Just over two years later, she brought a baby boy, Saint, into the world.

On Monday’s episode of “Live with Kelly & Ryan,” she reflected back on the first few months of learning how to balance two children instead of just one.

She told host Ryan Seacrest — who also serves as executive producer on her hit E! show — that, like she expected, North was not happy about sharing with her new little brother.

However, she also expected that attitude to fade away in time.

Nearly two years later, she says she sadly doesn’t think it’s a phase:

“I don’t know if it’s because she’s the older sister. I don’t know what it is. I thought it was a phase. She does not like her brother and it’s so hard for me.”

Being one of four siblings, two half-siblings, and four ex-step siblings, Kardashian surely has a memory or two of not wanting to share with her brothers and sisters, but, judging by their seamless collaborative success, she eventually learned.

Her daughter, according to Kardashian, doesn’t seem to be interested in ever sharing:

“She would get so jealous when I would breastfeed and all that kind of stuff. And now, the phase isn’t going away.”

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My cutie!

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North is even doing her best to make sure her mother doesn’t notice. Kardashian told the audience the 4-year-old girl does what she can to exclude her little brother:

“She thinks she’s outsmarting me. Like, she’ll have a tea party and say, ‘No boys allowed.’”

Now that she and West are planning on expanding their family even more, Kardashian’s concerns might multiply as her children do.

Though she doesn’t know if her daughter will grow out of disliking her little brother, many families with multiple children can totally relate to her problem — and that, alone, may give her some hope.

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