In response to the picture, which has since raked in nearly 2 million likes, Kourtney Kardashian commented, "Little tiny goose bunny".
Doting aunt Kendall Jenner also weighed in on the photo, writing, "what it do babbbyyyyyy".
This is the fourth photo we've seen of the couple's baby boy. In June, Kim— who's also mum to North West, 6, Chicago West, 17 months, and Saint West, 3— melted hearts across the globe when she shared a gorgeous photo to Instagram which showed her son Saint gently cradling Pslam's face.
"My Boys," the KKW Beauty founder captioned the post, adding two love heart emojis.
The budding criminal lawyer announced the birth of the couple's new bundle of joy on social media earlier this year, letting fans know "He's here and he's perfect".
Despite being an exciting time, Kim copped a serious amount of backlash when she shared the first photo of their son to Instagram.
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.
Despite this, a source close to Kim clarified that the photo was, in fact, staged.
“It was a split-second, staged photo,” a source told PEOPLE of the incident and resulting criticism