March 29, 2018 06:05 PM

Cody Garbrandt is a dad!

The 26-year-old former UFC Bantamweight Champion and his wife Danny welcomed their first child, son Kai Fisher Garbrandt, on Monday, March 12, they revealed on Instagram.

A rep for Garbrandt tells PEOPLE exclusively that the baby boy weighed 6 lbs., 3 oz., at birth, and measured 19¼ inches long, sharing two exclusive snaps — including one of the new family of three taken shortly after Kai’s birth.

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Cody Garbrandt, wife Danny and son Kai
Courtesy Cody Garbrandt
Kai Garbrandt
Courtesy Cody Garbrandt

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Garbrandt — author of the upcoming memoir The Pact: A UFC Champion, a Boy with Cancer, and Their Promise to Win the Ultimate Battle — and Danny tied the knot in July, announcing in October that their family would be expanding.

“My wife and I are excited to announce that we’re expecting the biggest blessing of our lives!!” the then-dad-to-be captioned a snap of the couple holding a strip of ultrasound photos. “Can’t wait to start this next chapter with you @pimsanguan 🤰🏻❤🙏🏽#TheGarbrandts #MyMotivation

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The spouses revealed they were expecting a son shortly after, sharing a video of themselves popping a balloon containing blue confetti.

Both Garbrandt and his wife thought the baby would be a girl, with Danny admitting in a sweet video montage from their gender reveal party, “I’ll be really surprised if it’s a boy.”

Garbrandt’s book The Pact comes out May 8, and is available for pre-order now on amazon.com.

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