Turia Pitt has shared the sex of her unborn baby.

Just days after returning home from Africa and after offering a glimpse of her beautiful, pregnant belly on Instagram, Turia Pitt has revealed her baby’s sex.

“Crazy to think that our new little third wheel is halfway cooked! The scan told us we’ve got a kid with an X chromosome and a Y chromosome on the way …. yep, it’s a boy!” Pitt wrote on her blog.

The 29-year-old former mining engineer previously posted a picture from her travels in Namibia in which she exposed her tummy as a means of connecting with pregnant women from a local tribe.

“Pregnant bellies… some things cross all cultural boundaries!” Pitt captioned the image. “Whenever I meet new people, the first thing I do is find something in common with them.

“This remote Himba tribe was easy once I lifted up my shirt.”

Pitt and her fiancé Michael Hoskin last month announced they are expecting their first child during an interview with 60 Minutes.

“We’re stoked. We couldn’t be happier,” Hoskin told the program. “Turia told me the other day she’s the happiest she’s ever been in her life.”

The couple are currently in Africa on a much-needed holiday.

“Michael and I are about to head off on an epic safari through Namibia!" Pitt wrote on Instagram late last month. "We’re taking this time to just switch off and enjoy the company of each other, and I suppose, a lion or two as well.”

The Interplast ambassador had been planning a trip to Nepal when she discovered she was pregnant. She was to lead a trek to support the organisation, which provides life-changing plastic surgery and medical training across the Asia-Pacific.

As you can probably tell by our sick hats, Michael and I are about to head off on an epic safari through Namibia! We’re taking this time to just switch off and enjoy the company of each other, and I suppose, a lion or two as well ???????? I’ll be mostly offline for the next two weeks but might jump on here every now and then to share a snap from our adventures. See you when we get back! T x

A post shared by Turia (@turiapitt) on Jun 22, 2017 at 2:44pm PDT

Pitt herself endured more than 200 procedures over five years after she became trapped in a grass fire that left her with burns to 65 per cent of her body.

The Tahitian-born woman was competing in an ultra-marathon in the Kimberley region in 2011 when the blaze swept through the course.

As she told Mamamia's No Filter podcast last year, “Physically, it’s pretty obvious what I’ve gone through. But for me, emotionally, I think, ‘Well, the fire was only five seconds of my life, and I don’t want to let that five seconds tell me who I am and what I can do and what I can’t do in this world’."