The new royal baby will receive a uniquely Australian gift as leaders send their best wishes to Prince William, Kate Middleton and their new-born son.
Britain's new prince will soon be snuggling a soft and cuddly bilby toy and will have a zoo enclosure named after him as a gift from his future Australian subjects.
The soft toy is part of a uniquely local gift pack selected by Prime Minister Kevin Rudd for the first child born to Prince William and Kate overnight.
The royal bub will be able to get acquainted with the toy bilby until he is old enough to visit a real-life version at the enclosure to be named in his honour at Sydney's Taronga Zoo.
Mr Rudd said the government would honour the royal family's commitment to conservation with a $10,000 grant for the zoo's research project to preserve bilbies, a treasured but threatened Australian marsupial.
"This will be in honour of the new baby prince," Mr Rudd said.
The name of the baby - and the enclosure - is yet to be decided.
But Education Minister Bill Shorten had a suggestion.
"Prince Kevin has a ring to it," Mr Shorten said in Melbourne on Tuesday.
When the royal bub does one day visit Australia, he and his parents will have free passes to the zoo so he can check in on his marsupial friend.
The royal couple will also be sent a much-loved Australian story to read to their newborn - Mem Fox's "Ten Little Fingers and Ten Little Toes".
Mr Rudd said he expected all Australians would share the joy of the royal family on their newest addition as prominent Australians extended their congratulations.
Governor-General Quentin Bryce said the birth of a baby is an experience to celebrate and cherish.
Long-time monarchist and Opposition Leader Tony Abbott said the birth of the Duke and Duchess of Cambridge's son would be the happiest day of their lives.
The Australian Republican Movement also sent its best wishes to the people of the United Kingdom on the birth of "their future monarch".
"We look forward to a future day when an Australian head of state can stand beside the British monarch as friends and equals," national director David Morris said.
Taronga Zoo said it was incredibly proud Australia's gift to the royal couple had recognised the remarkable and unique wildlife of Australia.
Queensland babies born on the same day as the future monarch will have the occasion commemorated with a boxed medallion, while Brisbane's Story Bridge will be lit up blue.