What to know about the newest royal baby

Prince William and his wife Catherine with their newborn son, who is fifth in line to the throne. (AAP)

Here's everything you need to know about the Duke and Duchess of Cambridge's third baby, a boy who was born on Monday.

ALL YOU NEED TO KNOW ABOUT BABY CAMBRIDGE NUMBER THREE

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* The Duke and Duchess of Cambridge's third baby, a boy, was born at 11.01am on Monday April 23

* The baby was born at the private Lindo wing at St Mary's Hospital in Paddington, London where Catherine previously had two straightforward deliveries

* The new baby is a brother to four-year-old Prince George, who was born on July 22, 2013, and two-year-old Princess Charlotte, who was born on May, 2, 2015

* The name of the new prince is yet to be announced, but he weighed in at 8lb 7oz - 3.8kg

* Prince William was present for birth

* George and Charlotte visited their new baby brother in the hospital

* Catherine and William took the baby home to Kensington Palace just hours after he was born

* Catherine's pregnancy was announced in September after she pulled out of a public engagement due to hyperemesis gravidarum, a form of severe morning sickness which she also had during her first two pregnancies

* William and Catherine are the first members of the Queen's immediate royal family to have more than two children since she and Prince Philip had their four children

* The baby is the Queen's sixth great-grandchild and fifth in line to the British throne, bumping uncle Prince Harry down to sixth spot

* In terms of titles, the baby will be His Royal Highness, a Prince of Cambridge

* The bookies are banking on William and Catherine again opting for a traditional name with Arthur, James, Philip or Albert all good bets for a boy

* When George was born, Australia sent a soft cuddly bilby toy and a copy of beloved Australian author Mem Fox's picture book Ten Little Fingers and Ten Little Toes as part of a gift pack selected by then prime minister Kevin Rudd

* An enclosure at Sydney's Taronga Zoo was also named after the young prince, with a $10,000 grant for the zoo's project to preserve bilbies also made in his honour

* Charlotte received a hand-embroidered Tasmanian merino wool blanket decorated with wattle, with a $10,000 donation made to a possum sanctuary in Victoria

* George was just eight months old when he visited Australia with his parents in April, 2014

* Prince William also visited Australia as a nine-month-old baby, joining his mother, Diana, Princess of Wales and his father Prince Charles on a tour in 1983.

Source AAP

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