Kanye and Kim Kardashian West recently celebrated their son Psalm's first birthday
Kim Kardashian and Psalm
Kim Kardashian West and son Psalm
| Credit: Kim Kardashian/ Instagram

Now that son Psalm is walking, Kim Kardashian West will be keeping up with him!

The mother of four, 39, shared her 13-month-old son's milestone on social media Friday, giving her fans and followers a cute update in her youngest child's life.

"My baby boy Psalm is the sweetest! He just started walking!" Kardashian West wrote, along with two mother-son photos of the pair lounging on a chair together.

The Keeping Up with the Kardashians star and husband Kanye West are also parents to son Saint, 4, as well as daughters Chicago, 2, and North, who turns 7 on Tuesday.

Similarly, Psalm's siblings all took their first steps around the same age. Brother Saint started walking at 13 months old and sister North's first steps were documented in July 2014.

Never miss a story -- sign up for PEOPLE's free daily newsletter to stay up-to-date on the best of what PEOPLE has to offer, from juicy celebrity news to compelling human interest stories

Psalm, who was born in May 2019, recently celebrated his first birthday.

"Psalmy you complete our family. You make everything perfect. I love you so much!!!!" Kardashian West wrote in a birthday tribute to her son.

And Psalm has been spending plenty of quality time with his family, as seen on Kardashian West's social media.

On Wednesday, the KKW Beauty mogul shared an adorable photo of all four children playing together outside at their home.

RELATED VIDEO: Kim Kardashian Shares Adorable Photo of Her Youngest Kids, Chicago and Psalm: "My Heart!"

As of the late, the West family has lots to celebrate following many birthdays and an anniversary. Rapper West marked his 43rd birthday earlier this month, which his wife honored on social media with a sweet shout-out.

"Thank you for always being you and never letting the world change who you are! Life wouldn't be the same without you!" she wrote alongside a throwback photo of the couple on vacation.

And in May, the parents of four celebrated their six-year wedding anniversary. "6 years down; forever to go Until the end," Kardashian West wrote in a post in honor of them tying the knot in Florence, Italy, in 2014.

"Kim and Kanye seem very happy. They feel very proud about their marriage and they love being parents," a source previously told PEOPLE.