Many older children get a bit jealous when they first get a baby sibling – and apparently North West is no different.
“For some reason, North hates when I feed the baby, and she lays on my lap so Saint can’t be right in front of me to eat, LOL!” she wrote.
Seems like someone has a case of sibling rivalry...but luckily, Kardashian has found a solution: pumping breast milk, and then getting North to help her bottle feed the baby.
"That totally worked! She loved helping me, as opposed to my attention being off of her, and now she is my little helper," she continued.
The reality star also shared some breastfeeding advice with other new mums, declaring that using nipple shields had helped avoid soreness.
WATCH Kim Kardashian talk about North West with Ellen. Post continues after video...
"I find the baby feeds better, and it allows me to never get irritated nipples or anything because they're protected by the shield," she said.
"The hospital suggested shields to me, since at the beginning I found nursing super painful and difficult, so I took some home and never looked back."
Kardashian, who is married to rapper Kanye West, also shared her views on breastfeeding in public.
"I know some people find breastfeeding such a private, personal experience, while other people are very open and even breastfeed in public," she began.
"Now that I'm a mum, I say whatever makes you comfortable goes. I still personally wouldn't breastfeed at a restaurant with a bunch of people I didn't know staring at me. I've seen this before and remember tweeting how shocked I was.
"Now that I'm a mum, I'm not that shocked, especially if you have a few kids and can't leave to breastfeed one kid in the bathroom while leaving the others at the table."
Amen, Kim - and thanks for keeping the breastfeeding conversation on the agenda.
Did your children ever suffer from sibling rivalry?
TAP on the image below and scroll through the gallery to see Kim Kardashian's pregnancy style...