“So excited for @bjenner and Valerie. They named their adorable first child Bodhi. The first Jenner boy!! the name moves on :),” the I Am Cait star, 66, captioned the family photo.
“She did it!” Burt captioned an image of Pitalo holding their baby boy.
The proud new papa also shared a photo of their newborn napping on mom’s chest.
“So far so easy… Only 17 years 364 days to!” he wrote.
Burt, a race car driver, is Caitlyn’s first child with her first ex-wife Chrystie Scott.
Burt has supported Caitlyn since she went public with her transition last year.
“I’m very excited. Part of me was screaming to say, ‘Hey, I’ve known for 25 years and I’ve always been supportive!’ I always will be,” Burt said in October. “I’ve always tried to be an outspoken supporter of the LGBT community.”