It's not easy being a mother to two small children, but Kim Kardashian has revealed that a little creativity can go a long way when the going gets tough.

Speaking to chat show host Ellen DeGeneres about the sibling rivalry between her little girl North, who turns four-years-old in June and baby Saint (17 months), Kim admitted their relationship is not starting out as she planned: "North just beats him up all day long, and he doesn't cry... she's just awful. She's so jealous. I thought it was a phase, and it's not going away." "She says boys aren’t allowed in her room. When she’s gone to school I’m like, ‘It’s time! Let’s go in her room, do what you want, go crazy!’" So determined is little North to keep hold of her mother's attention, she even kicked up a fuss when it was time for Kim to breastfeed her baby brother. To keep the peace, Kim had to hold a milk box with a straw near her breast for North while feeding Saint with the other. "When I was breastfeeding him, she was so jealous I had to get a little milk box and put it in the other bra with a straw so she could drink and he could drink. "It's crazy, the things you do," she giggled.