Hello, "Psalm Ye."
Kim's choice of caption has many fans thinking Psalm's middle name is Ye.
Psalm is the only child of the KKW Beauty mogul and her rapper husband to have a middle name.
Daughters Chicago, 16 months, and North, 6 this month, plus son Saint, 3, all do not have middle names.
Kim Kardashian West shared the first photo of her newborn son on May 17, where she officially revealed to the world the name they had chosen, as well as a text message Kanye West had sent to her.
“Beautiful Mother’s Day with the arrival of our fourth child. We are blessed beyond measure. We have everything we need,” the message read.
WATCH BELOW: Kim Kardashian shares that she had the most extra baby shower... Joined by family members like Kylie Jenner, Kourtney Kardashian and Khloe Kardashian - It is the stuff of your dreams.
The first photo of baby Psalm caused some drama.
Baby Psalm was wrapped in blankets and resting in a crib that was filled with other soft objects, including crib bumpers. Many fans were worried about SIDS.
A pal of the pair have since shared the thought behind the photo.
“It was a split-second, staged photo,” a source told PEOPLE of the incident and resulting criticism.
“As a mother of four, [Kim] very much knows how to keep her newborn safe in the crib. Again, it was staged for a photo.”
