IT'S one thing to plan a wedding on a special date, but quite another to pull off a natural birth on the 11/12/13 at 14.15pm.

Little William Thurlow was born at 2.15pm last Wednesday, December 13, surprising first-time parents James and Julia Thurlow with his perfect timing.

"It's uncanny," Mrs Thurlow said.

"We made our wedding date easy to remember - on the fifth of the fifth - and now there's no excuses for forgetting this date either."

The Blackburn South baby was delivered weighing 3.67kg at the Waverley Private Hospital by obstetrician Ravi Kashyap.

Even more uncanny was that Dr Kashyap helped deliver a baby five years ago at 8.08am on the eighth of the eighth, 2008. That's 08-08-08-08-08.

Mrs Thurlow said she and her husband, James, had originally thought William might appear at 9.10am, making his arrival at 9.10.11.12.13.

"We didn't even think about the afternoon, and then when it was all happening and we'd made it past two o'clock, we thought, 'We can really do this'," Mrs Thurlow said.

"His head had come about by 2.12pm, and then the rest of him was out by 2.15pm," she said

But the Thurlows said at the end of the day it didn't matter when William arrived, just that he was healthy and happy.

"I guess maybe given his birth date and time, maybe he'll be doing something with numbers, like an accountant," Mrs Thurlow said.

"We were really just so excited to meet him, and we love him so much already."