"Rare," the rapper, 26, captioned a photo of his son, in a pint-sized black jacket and dark pants (with rockin' red shoes).
In another photo, of King Cairo wearing a helmet Tyga wrote, "StuntKid."
And in a third shot, of his son with his arms around Tyga's neck, he wrote, "Moments."
While the Kardashian-Jenner clan may be icy (if thawing) on the subject of Chyna's pregnancy, her former flame has had positive thoughts to share about her new relationship.
"Everybody deserves 2 be happy. What some1 does for their happiness is not my concern, as long as it's not interfering wit my happiness," Tyga tweeted in April, after Chyna's engagement, adding:
"It makes me happy to see the mother of my son happy.My only concern in this situation is my son. I want him in happy environments. He's innocent in this. & I want him to feel as much love as possible."