Prince William, Prince George, Princess Charlotte

David Fisher/REX/Shutterstock

Prince George is a big brother once again!

The future King of England has a new little sibling to watch out for, a baby brother this time! George's parents, Prince William and Kate Middleton welcomed their third child on Monday morning.

Prince George and Princess Charlotte were spotted arriving at the hospital on Monday afternoon to meet their new brother. And now that the family has welcomed a new member, we're taking a trip down memory lane to George's earliest years.

The Duke and Duchess of Cambridge's eldest child, who was born on July 22, 2013, will celebrate his fifth birthday in July. But before that, let's look back at the adorable boy's baby pics!

Prince Louis Christening, Prince William, Prince George, Princess Charlotte

Dominic Lipinski/Pool Photo via AP

Prince George looked dapper at the christening of his little brother, Prince Louis.

Prince George, Savannah Phillips, Princess Charlotte

Max Mumby/Indigo/Getty Images

The royal siblings appeared to have a ball at the Maserati Royal Charity Polo Trophy at the Beaufort Polo Club.

Kate Middleton, Prince William, Princess Charlotte, Savannah Phillips, Prince George

Karwai Tang/WireImage

During the 2018 Trooping the Colour, Prince George's cousin Savannah Phillips covered his little mouth.

Prince George, Royal Wedding

Brian Lawless/PA Wire

Prince George served as a Page Boy for Prince Harry and Meghan Markle's wedding.

Prince George, Fourth Birthday Portrait

Chris Jackson, Getty Images

Happy fourth birthday, Prince George!

Prince William, Prince George, Princess Charlotte

David Fisher/REX/Shutterstock

Prince George visits his little brother Prince Louis for the first time.

Prince William, Kate Middleton, Prince George, Princess Charlotte, Royal Christmas Card 2017

Chris Jackson/Kensington Palace/Getty Images

For their 2017 Christmas card, Prince William and Kate Middleton shared a photo of them with Prince George and Princess Charlotte in matching blue ensembles.

Prince George, Prince William, Thomas's Battersea

Richard Pohle/The Times/PA Wire

Prince George looked a tad bit nervous on his first day of school at Thomas's Battersea in the London 

Prince George of Cambridge

Chris Jackson/Getty Images

The little prince arrives with his family to Berlin Tegel Airport during an official visit to Germany and Poland in mid-July 2017, just before his fourth birthday.

Prince George, Royals Gift Guide

Pete Souza/The White House via Getty Images

Prince George met former President Barack Obama in 2017.

Prince George, Trooping the Colour 2017

Chris Jackson/Getty Images

The little prince looks a bit bored on the Buckingham Palace balcony with his parents Kate Middleton and Prince William and sister Princess Charlotte.

Kate Middleton, Princess Charlotte, Prince George, Pippa Middleton and James Matthews Wedding

Kirsty Wigglesworth - Pool/Getty Images

The prince is an adorable page boy at aunt Pippa Middleton's wedding to James Matthews.

Prince George

Chris Jackson - Pool/Getty Images

The prince attends a children's party for military families in Canada with his family.

Prince William, Prince George, Princess Charlotte, Kate Middleton, Canada

Stephen Lock - Pool/Getty Images

The prince joins parents Prince William and Kate Middleton and sister Princess Charlotte onboard a sea-plane on the final day of their Royal Tour of Canada in October 2016.

Kate Middleton, Duchess of Cambridge, Princess Charlotte, Prince George

Mark Cuthbert/UK Press via Getty Images

Sporting a white shirt with blue accents, Prince George is joined by his sister, Princess Charlotte, during the the historic event marking the Queen's 90th birthday. 

Prince George, Catherine, Duchess of Cambridge, Kate Middleton, Prince William

Chris Jackson/Getty Images

Rocking a set of blue ear protectors, Prince George sits besides his mother in a Squirrel helicopter during a visit to the Royal International Air Tattoo in early July 2016.

Queen Elizabeth, Prince George, Prince William, Royal Mail Stamps

Ranald Mackechnie / Kensington Palace

Prince George and his royal family are all smiles in their official family portrait for the country's Royal Mail Stamps. 

ESC: Prince George

Kensington Palace

The little prince sits on a rocking chair in front of his parents and President Barack Obama during the U.S. leader and wife Michelle Obama's first meeting with him, during a dinner at Kensington Palace in April 2016. The two had given him the toy for his first birthday.

Kate Middleton, Prince William, Prince George, Princess Charlotte

JOHN STILLWELL/AFP/Getty Images

The little dude shows off rosy cheeks as snowflakes fall around him and his precious family.

Kate Middleton, Prince William, Prince George, Princess Charlotte

JOHN STILLWELL/AFP/Getty Images

Prince George enjoyed his first trip to the snow with mom, dad and little sister Charlotte.

 Queen Elizabeth II, Royals, Prince George, Prince William, Ducess of Cambridge, Catherine, Trooping of the Colour

AP Photo/Tim Ireland

The little prince made his Buckingham Palace balcony debut at the event, which celebrated his great-grandmother Queen Elizabeth II's 89th birthday.

Prince George, 3rd Birthday

PA Images/Sipa USA

George appears in an official palace photo for his third birthday.

Prince George, Catherine Duchess of Cambridge, Kate Middleton

Rupert Hartley/REX USA

Prince George takes a stroll with his mom at Beaufort Polo Club. 

Prince George of Cambridge

Max Mumby/Indigo/Getty Images

The royal nanny makes sure George can get a good view through the window of Buckingham Palace.

Princess Charlotte, Prince George, Duchess Catherine, Prince William

HRH Duchess of Cambridge

Little George affectionately plants a wet one on his little sister Princess Charlotte's forehead. 

Prince George, Catherine Duchess of Cambridge

Chris Jackson/Getty Images

Showing her mama bear instincts, Kate Middleton makes sure her son doesn't fall and tumble down the hill. 

Prince George, Catherine Duchess of Cambridge

Rupert Hartley/REX USA

The super duper cute prince sits on the Duchess of Cambridge's lap after watching some polo. 

Princess Charlotte, Prince George, Duchess Catherine, Prince William

HRH Duchess of Cambridge

The prince holds his baby sister Princess Charlotte in these official palace portraits taken by mother Kate Middleton.

Prince George, Faces

Chris Jackson/Getty Images

The prince leaves the Church of St Mary Magdalene on the Sandringham Estate for the christening of his sister Princess Charlotte.

Prince George, Prince William, Kate Middleton

John Stillwell/PA Wire/Press Association via AP Images

A celebration fit for a Prince! Prince William and Kate Middleton arrive at Chapel Royal in St. James's Palace for their son's christening.

Prince William, Duke of Cambridge, Prince George

Chris Jackson/Getty Images

The Duke of Cambridge and his son wave at reporters as they enter St. Mary's Hospital in London, where Kate Middleton had an hour earlier given birth to Princess Charlotte.

Prince George, Kate Middleton, Prince William

John Stillwell/PA Wire

It was a happy first birthday for Prince George as the family visited the Sensational Butterflies exhibition in London.

Prince George

TRH The Duke and Duchess of Cambridge/PA Wire

The royal baby strikes a handsome pose at Kensington Palace in this official royal family Christmas photo.

Prince George

The Duchess of Cambridge

The prince makes his way into Westacre Montessori School near his family's home in Anmer Hall in Norfolk, England in January 2016.

Duchess Catherine, Prince William, Prince George, Kate Middleton

Anthony Devlin/PA Wire/Press Association via AP Images

Prince George arrives at Wellington Military Terminal on the first day of his family's official visit to Australia.

Prince William, Kate Middleton, Prince George

Chris Jackson/Getty Images

The royal family ended their overseas visit to Austrailia and New Zealand, but it looks like something from down under caught Prince George 's eyes.

Prince George of Cambridge, Duchess Catherine, Kate Middleton

James Whatling-Pool/Getty Images

It looks like he's not enjoying his first official overseas trip in New Zealand as he pulls on mom's hair.

Kate Middleton, Prince William, Prince George

Ryan Pierse/Getty Images

Prince George arrives in Austrailia for his first official overseas trip.

Prince George, Official Portrait

John Stillwell/Press Association

He's on the move! Prince George takes his first solo steps ahead of his first birthday.

Catherine Duchess of Cambridge, Kate Middleton, Prince George

© i-Images, PacificCoastNews.

The royal baby stays close to mum while he watches Prince William and Prince Harry's polo match in London.

Kate Middleton, Duchess of Cambridge, Prince William, Prince George

Chris Jackson/Getty Images

Prince George and Prince William share a sweet father-son moment at the Taronga Zoo in Sydney, Australia.

Kate Middleton, Duchess of Cambridge, Prince William, Prince George

Chris Jackson/Getty Images

The cute babe shows his excitement as he meets his bilby namesake at the Taronga Zoo.

Prince George, Kate Middleton, Prince William

Getty Images

The adorable tot holds on tight to his mom during a playdate at the Government House in Wellington, New Zealand.

Prince George of Cambridge

James Whatling-Pool/Getty Images

The royal baby has some fun with his toy at the Plunkett's Parent's Group in Wellington, New Zealand.

Prince William, Duchess Catherine, Kate Middleton, Prince George

Government House NZ via Getty Images

Lucky boy! The prince receives a brand-new blue teddy bear upon arrival at the Government House in Wellington, New Zealand.

Duchess Catherine, Prince William, Prince George, Kate Middleton

Anthony Devlin/PA Wire/Press Association via AP Images

The Duke and Duchess of Cambridge touch down at Wellington Military Terminal with Prince George.

Prince George, Duchess Catherine, Kate Middleton, Duke William, Prince William, Lupo

JASON BELL / CAMERA PRESS

The happy family of three is all smiles as they pose for a family portrait with their pup Lupo.

Prince George Christening, Official Portrait

JASON BELL /CAMERA PRESS/ REDUX

The immediate royal family gathers round to celebrate the wee heir's christening.

Photos

See More From Prince George's Cutest Photos

The royal baby's name has yet to be announced! Let us know what you think the couple will name their baby boy in the comments!

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