"Beautiful Mother's Day. With the arrival of our fourth child. We are blessed beyond measure. We have everything we need," Kanye wrote in the message.
Psalm West pic.twitter.com/F0elQd1cJq— Kim Kardashian West (@KimKardashian) May 17, 2019
The couple have three other children, Saint, North, and Chicago.
Kim previously took to social media to say the newborn, who was born via surrogate, looks like "Chicago’s twin lol I’m sure he will change a lot but now he looks just like her."
He’s also Chicago’s twin lol I’m sure he will change a lot but now he looks just like her ✨— Kim Kardashian West (@KimKardashian) May 10, 2019
A few days ago, Kim had people trying to guess the name of her newborn after making posts to social media about her "CBD baby shower."
"We celebrated our baby boy about a week ago and now he’s here! He’s so perfect! Here are some pics of my CBD baby shower," Kim captioned one of the posts, which featured a picture of her family and friends. "I was freaking out for nothing because he is the most calm and chill of all of my babies so far and everyone loves him so much 🧸."
Another post featuring pictures from the shower was simply captioned with a bear emoji.
Many looked to the teddy bear emojis as a sign that the newborn's name was something bear-related.
So is the name Bear? Lol I’m over here looking for clues lol— YiYi 🎠 (@yiyisimplemente) May 11, 2019
Looks like the theories were wrong.
Kim Kardashian and Kanye West have officially welcomed their 4th baby 👶🏾— Complex Music (@ComplexMusic) May 10, 2019
Congratulations 🎉🎉🎉 pic.twitter.com/MvYsNCDyQ1