Great Britain: Royal baby Prince George to be christened on October 23
The Archbishop of Canterbury Justin Welby, the head of the world's Anglicans, will perform the christening at the Chapel Royal in St James's Palace in London.
George, who is third in line to the British throne, was born on July 22.
The royal family said the christening would be a private affair, but photographs will be taken after the service.
The names of godparents will be released nearer the time, a royal spokeswoman said, although it is rumoured that William's brother Prince Harry and Catherine's sister Pippa will be among them.
The announcement came after William and Catherine's new coat of arms was released.Approved by Queen Elizabeth II, it combines William's coat of arms and his wife's shield from the Middleton family coat of arms.
"Prince George's birth was a global event and there was huge excitement in New Zealand about his arrival, so it's only fitting he gets his own stamp," said New Zealand Post spokesperson Simon Allison.
The stamp design will show the royal baby just one day after being born, with his parents the Duke and Duchess of Cambridge holding him.
Prince William and his wife Kate released two informal family snapshots as the first official photos of their son, Prince George, on Tuesday, disappointing royal fans hoping to get a good look at Britain's newest royal heir.
George, the third in line to the British throne, was born on July 22 amid a global media frenzy, reflecting the international popularity of his parents and ongoing fascination with the British royal family.
The royal couple, known as the Duke and Duchess of Cambridge since their spectacular wedding in April 2011, gave the world the first glimpse of their newborn son when they left a London hospital the day after his birth but he has not been seen since.
However, instead of a traditional formal photograph for George's first official photo shoot, the couple released two shots taken by the duchess's father, Michael Middleton, in early August in the garden of her family home in Berkshire.
One photo shows Prince William, in a blue, open-necked shirt and jeans, with his arm around Kate, dressed in a fuchsia-colored dress and holding their sleeping son wrapped in a crocheted, white blanket.
The second photo shows the couple sitting on a picnic blanket with Kate again holding a sleeping Prince George. With them is their beloved black cocker spaniel, Lupo, while the Middleton family's golden retriever, Tilly, lolls at one side.
The photos are a far cry from the formal photographs released of Prince William a month after his birth in 1982 in which he was alert and wearing a long, laced gown. The pictures with his mother, the late Princess Diana, and father Prince Charles were taken by his great-uncle, photographer Lord Snowden.
Some royal watchers were disappointed that the first photos released of Prince George failed to show his face and were not of a professional quality.
But the decision to eschew tradition for a more informal approach was seen as true to form for William and Kate, both 31, who have tried to break away from royal traditions of rigid formality, be it by changing diapers themselves or William driving his family away from the hospital.
"They do like to do things in their own way and that is not a bad thing but in this particular instance they may come in for a bit of flack over this," Joe Little, managing director of Majesty magazine, told Reuters.
"People would have liked a better look at George and you can't see his face clearly. These are not much more than family snapshots and they are not of a professional standard."
The photos were released a day after Prince William gave his first interview since the birth, describing his son as a "little bit of a rascal" who does not want to go to sleep.
"As a few fathers might know I'm actually quite looking forward to going back to work," joked William, who is second in line to the throne after his father.
Voice of Russia, AFP, Reuters, Newstalkzb.co.nz, Tvnz.co.nz