Musk’s girlfriend and singer, Grimes, welcomed X Æ A-Xii — pronounced “X Ash A-12” — to the world in Could.
“The Second Final Kingdom,” Musk tweeted with the picture of himself holding his son whereas he speaks on the cellphone.
Musk, the richest man on the earth behind Amazon founder Jeff Bezos, according to Bloomberg’s Billionaires Index, first tweeted about X Æ A-Xii on Could 4, writing, “Mother and child all good.” He later posted a photograph with the new child on Could 5.
The music artist Grimes, 32, confirmed that Musk was the daddy in a Rolling Stone interview in March.
Musk has 5 sons from his earlier marriage to creator Justine Wilson.
Fox Enterprise’ Ken Martin contributed to this report.