Koto Nakamura and Sina Niakansafy had been told they were expecting a little girl, their birth photographer Jes Jackson told BuzzFeed News.

"They found out at their 20-week scan that they were having a baby girl," Jackson said.

Jackson, based in Tasmania, has been a photographer for about six years, but has spent the past year "ramping up" her birth photography business, she said.

The couple hired her to document their "daughter's" birth.