Sarah Stage in a photo posted days before her son's birth, and (right) four days post-birth.

Sarah Stage in a photo posted days before her son's birth, and (right) four days post-birth. Photo: Instagram

Most new mums would recoil at the thought, but Sarah Stage has shared a post-pregnancy selfie with her 1.6 million followers just four days after giving birth.

Clad in black pants and a patterned bra, the 30-year-old model recreated the standing-against-the-door, hair-twirling pose she had in a photo that attracted controversy towards the end of her pregnancy due to her not-obvious baby bump.

She captioned the Instagram snap: "4 days post baby. Total pregnancy weight gain was 28 pounds [12.7kg]. I'm excited to resume my workouts in 5 weeks!! #JamesHunter #HealthyBaby #GrannyPanties".

The image, which showed off Stage's sculpted abs, has received more than 46,000 likes a day after it was posted, with many users leaping to her defence.