Just five days after giving birth to her first child, fitness model Chontel Duncan is showing off her incredible post-baby body on Instagram.

The 27-year-old, who made headlines throughout her pregnancy for her tiny bump, posed in a matching bra and underwear set for a mirror selfie.

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Bump update 🍼 40 weeks… 5 days post delivery 🐵 Little D now known as Jeremiah 'MIAH' came 39weeks 2days (as you all would have noticed). My body is tender, it feels like someone did 12 rounds in the boxing ring using my core as the target. So much swelling is yet to go down & so much healing is yet to happen. I haven't seen my GP yet to see how my first week of healing has gone but when i do, it'll be then that I will be able to see a goal ahead with my healing process. The midwife & nurses follow up went well so fingers crossed i have a speedy recovery & continue on the straight road ahead. It's super crazy how different my body feels, I can't believe my bump is gone & I no longer have my baby hiding inside of me. To a degree I miss it but reality of actually having Miah in my arms is so much better. I wonder because I can't get back into training for a longer period of time how my body will change through purely just recovery/rest and nutrition… I'm excited because it gives me more time with Miah lol I'm an obsessive new mummy!!! Miah has settled in like a champ, feeds really well & sleeps heaps. I am so grateful to have had such a healthy happy baby. Looking forward to learning more about parenthood and to see the changes in my body as time persists

A post shared by CHONTEL DUNCAN (@chontelduncan) on

"Bump update 40 weeks," she captioned the pic. "My body is tender, it feels like someone did 12 rounds in the boxing ring using my core as the target. So much swelling is yet to go down & so much healing is yet to happen."

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The brunette beauty added, "I haven't seen my GP yet to see how my first week of healing has gone but when i do, it'll be then that I will be able to see a goal ahead with my healing process."

Chontel welcomed son Jeremiah Thomas at 8:24 p.m. on March 25. He weighed in at 7 pounds, 13 ounces.

"Healthy happy baby boy, absolutely nothing medical wrong with bubba, he is extremely alert and very strong shocking the staff here with his arms and neck strength," she wrote next a photo of the newborn.

Check out pics from Chontel's pregnancy in the gallery below!