London: Prince William`s wife Kate was in labor at a London hospital on Monday after weeks of feverish anticipation over the birth of their first child, who will be third in line to the British throne.
The royal couple, officially known as the Duke and Duchess of Cambridge, travelled by car to the St. Mary`s Hospital in west London before dawn and entered through a back door to avoid media camped outside the main entrance.
Kate is due to give birth to the child at the private Lindo wing of the hospital, where her husband was born to the late Princess Diana in 1982.
Kate and William, both aged 31, met when they were students at St. Andrews University and were married in April 2011 in a spectacular wedding broadcast around the world.
The royal birth has provoked a similar frenzy, with national and international media keeping up a deluge of speculative reports throughout Monday from outside the hospital.
The birth will be announced in the traditional way with an envelope containing the baby`s details taken from the hospital to Queen Elizabeth`s London residence, Buckingham Palace, where the news will be posted on a board outside the main gates.
"Things are progressing as normal. It wasn`t an emergency," a royal spokeswoman said.
Prime Minister David Cameron said it was an exciting time for Britain.
"Best wishes to them, a very exciting occasion and the whole country is excited with them. Everyone`s hoping for the best," Cameron told the BBC.
The baby will arrive at a time when the royal family is riding a wave of popularity. An Ipsos Mori poll last week showed 77 percent of Britons were in favor of remaining a monarchy over a republic, close to its best-ever level of support.
The royal birth might also help raise the national mood, battered by economic problems, unemployment, cuts in public spending and a rising gap between rich and poor.
The festive atmosphere has been heightened by a heatwave and a string of British sporting victories in tennis, rugby, cricket and cycling.
Royal supporter Terry Hutt, 78, who has waited outside the hospital for 12 days, acknowledged his joy over the imminent arrival.
"We`ve got a lovely married couple and baby will make three and they will be a family. It means everything to me, girl or boy, as they will be king or queen one day," said Hutt, dressed in a suit and hat emblazoned with Union Jacks.
Royal sources said Kate has planned a natural birth with William, a Royal Air Force search and rescue helicopter pilot, to be at her side. The royal couple do not know the baby`s sex.
The child will be third in line to the throne regardless of gender behind grandfather Prince Charles and father William after Britain and 16 other Commonwealth nations agreed to change royal succession rules so males no longer take precedence.
"Fundamentally all of them have agreed in writing to this," Cameron said. "It would not be a problem."
Royal officials have confirmed the baby will be known as His or Her Highness Prince or Princess (name) of Cambridge. The name may not be announced immediately - it took more than a week for an announcement of William`s name.
Bookmakers have a girl as the favorite with preferred names Alexandra, Victoria, Charlotte and Diana, in honor of William`s mother, who died in a car crash in Paris in 1997. George is the favorite boy`s name followed by James.
Queen Elizabeth, who celebrated 60 years on the throne last year, will be among the first to be informed of the arrival of the baby. It will be delivered by Marcus Setchell, the queen`s former gynecologist.
After the birth, commentators said Kate was expected to spend time at her parents` house in the village of Bucklebury, about 50 miles west of London, before eventually moving to London`s Kensington Palace, William`s childhood home.
The royal baby has already generated huge excitement globally, fuelled by the massive popularity of Kate, who has become a fashion icon, with her attire scrutinized and copied every time she steps out in public.
Scrutiny of Princess Diana`s life and her death while pursued by paparazzi instilled a deep distaste for the media in William and he has done his best to shield his wife from such attention.
Analysts said any economic impact from the royal birth would be positive but limited, with no public holiday and purchases of souvenirs or alcohol to toast the baby likely to be the main boosts.
"Having said that there is a lot of international interest in the royal baby with high foreign media coverage, which does help to advertise the UK globally," said Howard Archer, economist from IHS Global Insight.
Not all Britons, however, were giddy over the event.
The website of the Guardian newspaper offered readers the option of clicking on a "Republican" prompt, removing all references to the royal birth from its pages.