Popsugar Parenting Celebrity Babies Kim Kardashian Wishing North a Happy Birthday 2018 Kim Kardashian Jokingly Calls Out North For Not Being "Mature" on Her 5th Birthday! 15 June 2018 by Perri Konecky Image Source: Getty / James Devaney North West should know that turning 5 years old comes with a lot of responsibility . . . well, according to Kim Kardashian. On Friday, the mom-of-three took to social media to wish her first born child a happy birthday with sweet messages about her "best friend" and daughter. But if there's anything we know about Kim, it's that she loves to throw a little sass in whenever possible, and when it comes to parenting, it's far too relatable. "Now that you're 5, don't you think it's the mature thing to try to be nice to your brother!?!" Kim wrote on Twitter alongside a fabulously adorable photo of North in New York City the day before. Ha! Well, Kim, as a 26-year-old with a brother two years younger, that "mature" kindness should not be expected with age. Let's just hope when baby Chicago is a little bit older, she can mediate the fighting between her older siblings! Read on to see the hilarious birthday messages and all the funny (and reassuring) reactions on Twitter. Kim's Birthday Wishes My baby girl turns 5 today. Never did I think back then that I would have my best friend for life! I’m so honored to be your mom Northie! You have brought more joy into my world than I ever could have imagined. I can’t believe your so big now! The luckiest girl in the world to be best friends with your cousins and have the most magical parties together! I love you so much birthday girl! P.S. Now that you’re 5, don’t you think it’s the mature thing to try to be nice to your brother now!?! A post shared by Kim Kardashian West (@kimkardashian) on Jun 15, 2018 at 6:07am PDT 1 / 9 Kim's Sassy Birthday Wishes Now that you’re 5, don’t you think it’s the mature thing to try to be nice to your brother!?! pic.twitter.com/5TYpDX1tAe— Kim Kardashian West (@KimKardashian) June 15, 2018 2 / 9 The Reactions LMAO KIM CALLING OUT YOUR OWN DAUGHTER ON HER BIRTHDAY— kelli ♥ (@InvisibleOlivia) June 15, 2018 3 / 9 You would think.. my older daughter is 11 and the little one 3 and they always arguing and i tell the oldest one to be nice but she is like “she is always on my business” 🤦🏻♀️🤦🏻♀️ but they still love each other— Lolita (@Lolita0221) June 15, 2018 4 / 9 north lookin like “ i’m good, enjoy love”— Cloe ⚡️ (@tiredcloe) June 15, 2018 5 / 9 Lmao why is this me when I’m a mom. I’ll be shading my daughter on Twitter😂😂— rain (@yagurldrizzle) June 15, 2018 6 / 9 My younger brother and I hated each other till I was about 17... hope it doesn’t take her as long to get out of that phase that it did me 😂— Lauren Klintworth (@laurklintworth) June 15, 2018 7 / 9 North looking like.. pic.twitter.com/3YCRkpmvKm— DKT (@darleneturner53) June 15, 2018 8 / 9 I have 2 girls and my youngest was the meanest. She bosses her older sister and everyone around...and they all listened to her lol. She’s 19 now and still tries to be bossy!🙄— nikki souder (@NikkiSouder) June 15, 2018 9 / 9 Celebrity BabiesParenting HumorNorth WestCelebrity MomsKim Kardashian