Gold Coast woman Anthea Nicholas is believed to be Australia's oldest natural mother, at 50.

Gold Coast woman Anthea Nicholas is believed to be Australia's oldest natural mother, at 50. Photo: Australian Women’s Weekly

A Gold Coast woman has become what is believed to be Australia's oldest natural first-time mother, giving birth at 50.

Anthea Nicholas and her husband Paul Byrnes, 54, had a "one in several million" chance of falling pregnant, Ms Nicholas' doctor told the Australian Women's Weekly.

Ms Nicholas, a semi-retired real estate agent, told the Women's Weekly she was alarmed when she first discovered she was pregnant.

"I knew the odds for us would be horrendous," she said. "I had massive fear, there's no other word for it."

She gave birth to a baby boy called Nicholas in June.

However she said she didn't think she and her husband were too old to be parents.

"You can be old at 20 or young at 70, it's all about your attitude and your health," she said.

Ms Nicholas said it was taking a while to 'sink in' that she was a mother.

"Last year, the doctor told me I was going into menopause and now I've got a baby in my arms," she said.

"But he is perfect - not a blemish."

Ms Nicholas had a 70 per cent chance of miscarriage, her doctor told the magazine.

Australian Women's Weekly editor Helen McCabe said she hadn't been able to confirm if Ms Nicholas held the record for being the oldest natural mother in Australia.

"We think there are other women at 50 who have had babies, but [her case] is right up there in a global sense," she said.

Last year, a woman believed to be Australia's oldest mother gave birth to twins via IVF in Perth at the age of 57.

In 2007, a 56-year-old Queensland woman gave birth to an IVF-conceived child.