Arlo James Winnell and Thea Jen Blackman were born exactly nine minutes a part from each other but surprise, they are not twins.

Amy and Matthew Winnell are the proud parents of Arlo, who was brought into the world at 10.01 on Christmas morning, weighing eight pounds, three ounces.

Mrs Winnell said he did not arrive on his due date, but he came really quick after she went into labour.

"It was a beautiful Christmas Day. He is perfect," Mrs Winnell said.

Little Arlo has four big sisters, who were waiting for his arrival.

His sister Madison Fitzgerald, who is 10 years old, said she was really happy and excited to have a new baby brother for Christmas.

First time parents Hannah and Troy Blackman said it was a "big surprise" when little Thea decided to come much sooner than anticipated.

"We didn't expect her to arrive on Christmas Day. The original date was January 10, so a bit early," they said.

"It was an emergency C-section. Our waters broke at 2am on Christmas Day and it was go, go, go from there."

Mrs Blackman said her daughter was born at 10.10am, weighing nine pounds, eight ounces.

"It was a very different Christmas once she arrived, but very special, best present you could ask for," she said.

Despite sharing their birthdays with Christmas, both parents said their babies will be spoiled.

"We will make sure of that," Mrs Blackman said.