Fit mum Chontel Duncan says her abs made her baby's birth more difficult.

Queensland-based ‘fit mum’ Chontel Duncan has shared the birth story of her now-seven-month-old son, including the complication that saw doctors “struggling” to deliver him.

In an new Instagram post, Duncan admitted while she had hoped to deliver baby Jeremiah with a vaginal birth, she was advised a c-section was the only way to ensure the health of her and her baby.

“I cried, I felt like I failed…,” the Instagram sensation and blogger wrote alongside a photo of her c-section scar.

[Part 2] I CRIED I felt like I failed… but then @sam_hiitaustralia reminded me of my mantra which was “to go through all means necessary so baby feels nothing” & I smiled. With confidence I signed the forms & within 20mins had my baby in my arms. They struggled to rip Jeremiah from my tummy as my abs locked him in super tight as I began vomiting during the operation. This is why my scar was cut up on my right side because the surgeon had to cut me further an use forceps to successfully get Jeremiah out. Perhaps a down side to a strong core ???? I healed according to my doctor normally, my scar isn’t small, it’s quiet large & I can feel in the centre scar tissue, I tried Bepanthen Scar Treatment & Skincerity breathable masque an this is what I have been left with. I would love 3 more children & I will always try for a vaginal birth with each one. So to all the women out there wearing a cesarean scar, I am VERY proud of what mine means & for the beautiful gift I received through mine. They are memories of the day we all became mummies ????????????❤️????

A photo posted by Chontel Duncan (@chontelduncan) on Oct 27, 2016 at 5:00pm PDT

“But then Sam reminded me of my mantra which was ‘to go through all means necessary so baby feels nothing’.”

Duncan admitted it didn’t take long for her to be convinced this was the best outcome for all involved. However, the procedure didn’t come without its own complications.

“With confidence I signed the forms and within 20 mins had my baby in my arms. They struggled to rip Jeremiah from my tummy as my abs locked him in super tight as I began vomiting during the operation,” she recalled.

A photo posted by Chontel Duncan (@chontelduncan) on Oct 22, 2016 at 1:34am PDT

“This is why my scar was cut up on my right side because the surgeon had to cut me further and use forceps to successfully get Jeremiah out.

“Perhaps a downside to a strong core.”

Although she now sports a scar she hadn’t expected, Duncan wrote that she couldn’t be prouder of the marking and what it now represents.

Our first family photo @sam_hiitaustralia we made the most incredible little human. Business owner, DJ, husband & now father. Love you Sam ????

A photo posted by Chontel Duncan (@chontelduncan) on Apr 10, 2016 at 3:33am PDT

“To all the women out there wearing a cesarean scar, I am VERY proud of what mine means and for the beautiful gift I received through mine,” she said.

“They are memories of the day we all became mummies.”