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Prince WilliamDuchess Kate of Cambridge show their newly-born son, their third child, to the media outside St. Mary's Hospital in London, on April 23, 2018.
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LONDON — Duchess Kate of Cambridge gave birth Monday to a new little prince of Cambridge, a historic royal baby, her third, and the new fifth in line to the British throne. 

The baby, as yet unnamed officially, was born at St. Mary's Hospital in London at one minute after 11 a.m. local time and weighed 8 pounds, 7 ounces, Kensington Palace said in the birth announcement.

Shortly before 6 p.m. local time, she and Prince William emerged from the hospital, baby in her arms, as cheers from a small crowd of onlookers erupted and the cameras of the usual huge media mob whirred and clicked.

Kate was wearing a knee-length red dress with a white bib collar, and showed only a slight remaining baby bump. Later, they went back inside briefly, then reemerged holding hands, with Will carrying the baby in a baby car seat. Then they returned to their Kensington Palace apartment as news helicopters followed them from above.

Prince William was there for the birth, as he was for their previous two children. The baby, whose name the palace has not yet announced, was born on St. George's Day, marking the national day for England's patron saint. 

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Princess Charlotte of Cambridge waves at the media as she and father Prince William and brother Prince George of Cambridge enter hospital in London to see mum Duchess Kate and new baby brother on April 23, 2018.
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After the birth was announced, Will emerged about 4 p.m. local time and a half-hour later returned with his two older children, Prince George, 4, dressed in his school uniform, and Princess Charlotte, 2, who was wearing one of her trademark flowered dresses. 

Charlotte waved and smiled at the crowd of cameras, but little George looked more serious and kept his eyes on the ground as they entered the hospital. Will drove himself and his children in a blue Land Rover Discovery. The children were later returned to Kensington Palace, before their parents emerged with the new little prince.

The baby prince, by the way, was wrapped in a lacy white shawl from GH Hurt and Son, the palace said in a statement, explaining other royals have been presented with similar shawls in the past, including Will, George and Charlotte when they were babies.

The former Kate Middleton, 36, and Prince William, Duke of Cambridge, 35, arrived at the Lindo Wing at St Mary's Hospital, in London's Paddington neighborhood, early Monday by car. 

The baby is grandmother Queen Elizabeth II's sixth great-grandchild and becomes fifth in line to the throne. 

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Duchess Kate of Cambridge in one of her last public appearances before giving birth to her third baby, on March 22, 2018, at Olympic Park in London.
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He will join sister Princess Charlotte and Prince Georgein the growing Cambridge family, as the third grandchild of Charles, Prince of Wales, and his late first wife, Princess Diana. 

As with her previous pregnancies, Will and Kate did not know the sex of the baby beforehand, palace officials confirmed in a briefing weeks before the birth.

Typically, the palace does not immediately announce the new baby's name. Among the names favored by British bookmakers for a boy: Albert, Arthur, Frederick, James and Philip.  

More: Will & Kate's third baby: Royal well-wishers camp out, countdown in London

The little prince is a historic royal baby: Unlike previous princes born in the United Kingdom, he will not automatically displace his older sister, Princess Charlotte, 2, in the line of succession.

Shortly before older brother George was born, British law changed to make birth order the determining factor in succession, replacing gender — male primogeniture — as the default rule that developed over 10 centuries.

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The official notice of birth of third royal Cambridge baby is placed on an easel in the forecourt of Buckingham Palace on April 23, 2018 in London. The Duke and Duchess of Cambridge new baby prince was born this morning at 11:01, weighing 8lbs 7oz.
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Aware that a 300-year-old set of laws then governing the succession looked increasingly egregious and inexplicable in the 21st century, British lawmakers decided the time for "royal equality" had finally arrived.

The newest little royal will displace Uncle Prince Harry, 33, in the succession; he will move down to sixth in line, and any children he has will follow him.

As per previous royal births, great-granny the queen was first to be notified. Members of both families have been notified and expressed delight, the palace said. 

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Prince William, Duke of Cambridge, departs hospital after Duchess Kate gave birth to their son on April 23, 2018 in London.
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Then, in keeping with a 181-year-old tradition, a birth announcement was posted on an easel in the forecourt of Buckingham Palace, just as it was after George and Charlotte's births. Bells will toll and a gun-salute was set to start booming on Tuesday.

Now that the third Cambridge baby has arrived, attention will turn to Harry's upcoming wedding to American actress Meghan Markle, 36, at Windsor Castle on May 19. The other four Cambridges — his brother Will, sister-in-law Kate, nephew George and niece Charlotte — are expected to be there and play roles (Will as Harry's likely best man), but probably not the new baby. 

Like his siblings, the baby arrived without any medical crisis. The medical team was led by obstetrician Guy Thorpe Beeston and Alan Farthing, surgeon gynecologist to the queen, who also helped deliver the other royal babies.

George, Charlotte and Will and Harry, too, were born in the maternity Lindo Wing of St. Mary's, just a short drive from the Cambridge home at Kensington Palace. 

A blustery but sunny day in London, the site outside the hospital has been taken over by broadcasters from around the world who mixed with hospital staff, passersby and visitors to London. When the news spread that Duchess Kate gave birth to a healthy baby boy, cheers and brief clapping erupted.

“This is really crazy, I can’t believe it. Some of these people have been here for 15 days waiting for this to happen,” said Olivia Dragor, remarking on the chaotic scrum of media, tourists and royal well-wishers outside St. Mary’s in central London.

Dragor, 21, is spending a year abroad studying communications in London. Her home college is the University of Southern California. “We don’t really get this kind of thing back home,” she said, adding that she liked the royal family but is not a full-time devotee.

“It’s wonderful, it’s really nice to see people so happy and excited,” said Lynne Gant, 62, an Australian tourist who was waiting on the perimeter of barricades that had been set up for media here. 

Gant said part of her interest in the royal family stemmed from her grandmother, who was British.

Some Londoners reacted to the news that a new prince had arrived with typical British understatement. 

“It’s a good thing, pleased for them, but it’s time to get back to work,” said James Long, 29, an accountant who was passing by the hospital on his lunch break.

Prince Charles released a statement about his newest grandchild via Clarence House's official Twitter account Tuesday morning.

“It is a great joy to have another grandchild," he said, "the only trouble is I don’t know how I am going to keep up with them.”  

Prime Minister Theresa May, London Mayor Sadiq Khan and other British politicians and public figures sent their well wishes and congratulations over social media but otherwise did not reflect on the impact for the nation. 

Kate's other babies had easy deliveries (she gave birth and left the hospital on the same day for Princess Charlotte), in contrast to crippling bouts of acute morning sickness that forced her to cancel engagements and stay in bed in the early stages of her pregnancies. She was so ill she had to miss George's first day of his new school; Will did the solo dropoff instead.

The Cambridges are now full-time royals based in their sprawling 20-room Apartment 1A at Kensington Palace. George's school is just across the Thames River; Charlotte started at a nursery school near the palace in January. 

The family also has a country retreat, Anmer Hall, in Norfolk on the queen's Sandringham estate, where they may spend some time post-baby. Will is no longer working part-time in Norfolk as a helicopter rescue pilot and Kate has expanded her royal patronages and engagements to take on more royal duties.

Puente reported from Washington, D.C.