After the initial shock had passed, she was elated about the birth of her baby boy; she and her husband named him Taiga

The new mother had planned to call her new daughter Hinata and had been given numerous pink gifts for her baby

Eyes wide and open-mouthed the expression on this new mother's face is one of pure shock.

Koto Nakamura, who was in hospital giving birth to her first child, had just been told that the baby girl she thought she was giving birth to was in fact a boy.

The moment was captured by Koto and her husband Sina Niakansafy's birth photographer while they were in hospital in Tasmania, Australia.

In shock: Koto Nakamura, pictured, looked astounded when she was told the new daughter she was expecting was in fact a boy

Wrong gender: The new mother, pictured with her baby son, planned to call her new daughter Hinata and had been given numerous pink gifts for the baby girl

The couple had come up with a girl's name, Hinata, and had been given numerous pink presents for their new daughter.

But when Koto gave birth she could not disguise her shock and was rendered speechless when she was told she had given birth to a son.

'I thought everyone was joking,' she told Today Parents. 'I lost words and I couldn't believe it until I saw his bottom.'

Before the revelation, photographer Jes Jackson said they were 'laughing and joking' about it happening after they were told a story by Koto's midwife about a patient who had been given the wrong gender by an ultrasound tech.

Jes said: 'We were all laughing and joking about it, saying, "Oh gosh, as if that would happen to us".'

Koto said although she was shocked at first, ultimately she did not mind what sex her new baby was. Other pictures show her smiling and moved to tears by her new son.

Love: After the shock had passed she was elated with her new son, who Koto and husband Sina Niakansafy, pictured, named Taiga

New father: Photographer Jes Jackson captured the moment that the couple, from Tasmainia, Australia, were give the surprising news

'I was shocked for a few seconds, and then it didn't matter if it was a girl or a boy,' she said.

They named their son Taiga, which is a Japanese name and means 'big and gracious'.

Jes, who has her own company, Itty Bitty Photography, has been photographing births for four years but that she has never encountered such a surprising moment as Koto's.

She said it was 'one of the most amazing moments', adding: 'Pure shock, disbelief, excitement, happiness and relief.'

Posting the picture on Instagram, she wrote: 'The priceless look on a mamas face who was told she was having a baby girl but received a baby boy!!