Where did the time go?!

That's what we're asking ourselves after seeing Kim Kardashian's latest Instagram post: an adorable snapshot of her and Kanye West's youngest son, 21-month-old Psalm West. 

The Keeping Up With the Kardashians star shared the heartwarming pic on Wednesday, Feb. 24. Psalm can be seen clad in a matching brown sweatsuit, curiously staring into the camera. "The sweetest boy!" Kim captioned her post. "You can't tell here but he has the most infectious smile! I love you baby Psalm."