Can you guess the weight of the Windsor babies, from featherweight to whopper?

It’s one of the very first questions when a newborn arrives: ‘how much do they weigh?’

And when Princess Eugenie announced the birth of her new son, Ernest, on Instagram, she was happy to  share the news that he tipped the scales at 7lbs 1oz.

This is close to the national average – and to his senior cousins Princes William and Harry.

But the Windsor babies have come in a wide variety of sizes over the past century or so, as our graphic shows – from a tiny 4lbs 9oz to a new arrival at more than twice the weight.  

Lady Louise – 4lbs 9oz

Lady Louise was born on November 8 2003, four weeks early, when her mother Sophie, Countess of Wessex went into labour at 36 weeks pregnant.

At the time, her husband Prince Edward was in Mauritius – a 12-hour flight away – for an official visit. He had been contacted, but there was no way he could return until the next day.

She had been rushed to Frimley Park Hospital in Sussex after complaining of severe internal pains, where doctors found her seriously ill after she lost nine pints of blood through internal bleeding.

They had to perform an emergency caesarean as the condition was threatening to kill both her and her baby.

The tiny baby was delivered weighing just 4lbs 9oz. Baby Louise was then rushed to receive specialist care St George’s Hospital, while Sophie had remained 35 miles away in Frimley Hospital for another 16 days until she had recovered.

The official announcement from Buckingham Palace was made two days later, explaining the emergency caesarean and that Prince Edward had been on an official visit.

The statement added: ‘Her Royal Highness and her daughter will remain in hospital for the foreseeable future.’

Years later, in 2014, Sophie made an emotion return to Frimley Park Hospital to officially open a new neonatal unit.

Fighting back the tears she said: ‘I want to say well done to everyone for your fundraising, and for all the work you do to help thousands of families – your service is the difference between life and death.

‘I know all the staff are really keen to get everything started. It is a great working environment and the results you are having are testament to this investment.

‘It has been something really important in my life and so I thank you again for inviting me here today.’

Prince Edward – 5lbs 7oz

Prince Edward was born on March 10, 1964, and was the lightest baby out of his siblings weighing just 5lbs 7oz.

The youngest child of the late Queen and Duke of Edinburgh was born at Buckingham Palace.

For this birth, the Queen broke royal tradition by having Prince Philip join her in the delivery room, as written in his birth announcement ‘His Royal Highness the Duke of Edinburgh was present’.

The Queen had read in magazines about fathers being involved in the childbirth so wanted to do the same, royal expert Ingrid Seward wrote in her book ‘My husband and I: The Inside Story of 70 years of Royal Marriage’.

She said: ‘The Queen, by then aged 37, had asked him to be there; she’d been keenly reading women’s magazines that stressed the importance of involving fathers in childbirth and had become fascinated by the idea.

‘Thus Philip became the first royal father in modern history to witness the arrival of one of his children.’

Princess Anne – 6lbs

Princess Anne of Edinburgh was born on August 15, 1950, at 11.50am weighing exactly 6lbs.

Unlike her three brothers, the Queen’s only daughter was born at Clarence House rather than Buckingham Palace as it was undergoing renovations because of damage caused to the building during World War Two.

The couple lived in Clarence House between 1949 and 1953.

At the time, the BBC reported that details of the baby’s arrival had been ‘posted on the gates of Clarence House.

The Princess’ birth was commemorated by the firing of the Park and Tower guns.

Upon Anne’s birth, Prince Phillip declared: ‘It’s the sweetest girl’.

Queen Elizabeth – 6lbs

The Queen was born at 2.40am on April 21 1926, weighing the same as her daughter Anne at just 6lbs.

She was born at 17 Bruton Street in Mayfair, the London home of her maternal grandparents, the Earl and Countess of Strathmore.

At the time of her birth, her mother was known as Elizabeth, the Duchess of York, and Prince Albert, Duke of York.

The couple had been living in the London town house at the time when Elizabeth had a caesarean.

As was custom at the time, the Home Secretary Sir William Joynson-Hicks was present for the future Queen’s birth so the government could ensure the new arrival really was a direct descendant of the royal family.

The birth was announced in the London Gazette as well as other newspapers, which read: ‘Her Royal Highness the Duchess of York was safely delivered of a Princess at 17, Bruton Street, Mayfair.

‘His Royal Highness the Duke of York and the Countess of Strathmore were present. Secretary Sir William Joynson-Hicks was also present. Her Royal Highness and the Infant Princess are doing perfectly well.’

James, Earl of Wessex – 6lbs, 2oz 

The birth of James, Earl of Wessex, was much less traumatic than the birth of his older sister Lady Louise.

Born at 4.20pm on December 17 2007 also at Frimley Park NHS Hospital, he weighed 6lbs 2oz.

Prince Edward described his son at the time as ‘very cute and very cuddly’. He added that he was relieved the birth was ‘a lot calmer than last time’ and that his wife was ‘doing very well’.

A statement from the Queen’s secretary at the time read: ‘Her Royal Highness the Countess of Wessex today was safely delivered of a baby boy by caesarean section at 4.20pm, at Frimley Park NHS Hospital in Surrey. 

‘The weight of the baby was 6lbs 2oz. The Earl of Wessex was present.’

The couple did not have a name upon the announcement of the child’s birth, with the Earl of Wessex adding: ‘We didn’t know, we had no idea what we were going to get, we hadn’t asked.

‘You have to at least get to know the small person who’s just come into the world before you actually try and pick a name.’

Sienna Elizabeth Mapelli Mozzi – 6lbs 2oz

Sienna Elizabeth Mapelli Mozzi is Princess Beatrice and her husband Edoardo Mapelli Mozzi’s first child.

Beatrice, the oldest daughter of Prince Andrew and Sarah Ferguson, gave birth to the baby girl weighing 6lbs 2oz at 11.42pm on September 18 2021 at the Chelsea and Westminster Hospital in London.

Chelsea and Westminster is an NHS hospital but houses the private Kensington maternity wing.

Writing on Instagram, Beatrice’s sister Eugenie wrote: ‘Beabea and Edo, congratulations on your new angel. I can’t wait to meet her and I’m so proud of you.

‘We’re going to have so much fun watching our children grow up. Love Euge.’

She went on to pen a meaningful note to her niece writing: ‘To my new niece, I love you already and think you’re just awesome from the photos.. we’re going to have so much fun ⁣together. Love your Auntie Euge.’

The announcement from Buckingham Palace added that ‘the couple are looking forward to introducing to her big brother Christopher Woolf’.

Christopher, known by his nickname Woolfie, is Edoardo’s six-year-old son from his relationship with US architect Dara Huang.

Princess Beatrice – 6lbs 12oz

Not much heavier than her daughter, Princess Beatrice was born at 6lbs 12oz on August 8, 1988, to Sarah Ferguson, Duchess of York and Prince Andrew.

After her birth, Buckingham Palace released a brief statement which read: ‘Her Royal Highness the Duchess of York was safely delivered a daughter at 8:18pm today. Her Royal Highness and her child are both well.’

Her full name was announced at a later date, Beatrice Elizabeth Mary, being named after the youngest of Queen Victoria’s children.

Prince Harry – 6lbs 14oz

Prince Harry was born in the Lindon Wing of St Mary’s hospital after a nine-hour labour on September 15 1984.

Harry weighed 6lbs 14oz and was reportedly born in the same room his older brother William had been born in two years prior.

During the long labour, Diana read a book for the first six hours while Charles napped in a chair next to the bed, Town and Country Magazine reported.

Following the birth, Charles called the Queen to tell her of the news followed by Diana’s father, Earl Spencer.

Speaking to the reporters at the time, Charles said the baby had ‘pale blue yes’ and hair of ‘a sort of indeterminate colour’.

He described the baby as ‘marvellous’ adding that he ‘couldn’t be more delighted’.

To celebrate the birth of his second son, Charles held ‘an impromptu drinks party’ in his Land Rover at a polo ground in Windsor, Hello reports.

Ernest Brooksbank – 7lbs 1oz

Princess Eugenie announced the birth of her second son with husband, Jack Brooksbank, on Instagram.

Eugenie shared with followers that she had given birth to Ernest George Ronnie Brooksbank on 30 May 2023 at 8:49am.

The post included an adorable snap of August, Eugenie and Jack’s eldest son, with his newborn brother.

The caption explained: ‘He is named after his great great great Grandfather George, his Grandpa George and my Grandpa Ronald.

‘Augie is loving being a big brother already.’ 

Prince William – 7lbs 1.5oz

Upon his birth Prince William became the first direct heir to the throne to be born in a hospital, rather than Buckingham Palace.

He was born weighing 7lbs 1.5oz on June 21 1982, following the Princess of Wales 13 hours of labour.

In the announcement made by Buckingham Palace read: ‘Her Royal Highness the Princess of Wales was today safely delivered of a son at 9.03pm.

‘Her Royal Highness and her son are both doing well.’

Two minutes later a spokeswoman for the Palace added: ‘The baby weighs 7lbs 1/2 oz. He cried lustily. The Prince of Wales was present.

‘We have no names which we can announce at the moment.’

Prince Charles was said to have rung his mother who was ‘absolutely delighted’ whilst the Queen Mother was ‘overjoyed’.

The royal family even flashed the news to Prince Andrew who had been in the South Atlantic task force.

When he left the hospital, Charles was reportedly smiling broadly while he apologised for keeping those who had been waiting in the crowd.

He said: ‘I was immensely relieved when it was all over. The Princess was well and the baby’s looking lovely. It’s marvellous, he’s not bad.’

Princess Eugenie – 7lbs 1.5oz  

Princess Eugenie was born on March 23 1990 weighing 7lbs 1.5oz at the Portland Hospital in London.

A statement from Buckingham Palace at the time read: ‘This evening at 7.58 o’clock Her Royal Highness the Duchess of York was safely delivered of a daughter at the Portland Hospital.

‘His Roya Highness the Duke of York was present. Her Royal Highness and her daughter are both well.

‘The happy event has been commemorated by the firing of the Park and Tower guns.’

Prince Andrew – 7lbs 3oz

Prince Andrew was born on February 19 1960 at 3.30pm weighing 7lbs 3oz.

Like his elder brother King Charles, he was also born at Buckingham Palace but in the Belgian suite.

The announcement published in the London Gazette said: ‘This afternoon at thirty minutes at three o’clock her Majesty the Queen was safely delivered of a Prince at Buckingham Palace.

‘His Royal Highness the Duke of Edinburgh was present. Her Majesty and the Infant Prince are both well.’

Prince Archie Harrison – 7lbs 3oz 

Prince Harry and Meghan Markle’s oldest child, Archie was born at 5.26am on May 6, 2019, at the private Portland Hospital in London’s west end, weighing 7lbs 3oz.

Speaking in the hours after his birth, Prince Harry said the ‘little thing is absolutely to-die-for’ adding that he was ‘incredibly proud of his wife’, who recovered in Frogmore Cottage.

A statement from Buckingham Palace included a long list of members of the Royal Family who were ‘delighted’ at the news of the birth, including the Queen and Prince Philip, Prince Charles and Camilla, and William and Kate.

Two days later the couple announced they would call their newborn son Archie Harrison Mountbatten-Windsor.

His name Archie broke royal tradition as it is less formal than other royal names.

Speaking after the birth, the Duchess of Sussex said: ‘He has the sweetest temperament, he’s really calm.’

Isla Phillips – 7lbs 4oz

The second daughter of Peter Phillips and now his ex-wife Autumn, was born on March 29 2012.

Isla Phillips, who was born at the Gloucestershire Royal Hospital, weighed 7lbs 4oz – lighter than her older sister Savannah.

Buckingham Palace said: ‘The Queen, the Duke of Edinburgh, the Princess Royal, Captain Mark Phillips and Autumn’s family have been informed and are delighted with the news.

‘Isla Elizabeth is the second child for Peter and Autumn, the second grandchild for the Princess Royal and the second great-grandchild for the Queen and the Duke of Edinburgh.’

King Charles – 7lbs 6oz

Prince Charles was the heaviest baby out of his siblings, weighing 7lbs 6oz when he was born on November 14 1948.

The Queen, then known as Princess Elizabeth, was reportedly in labour for a painful 30 hours before she gave birth by Caesarean section.

At the time of the birth, Prince Philip was not present. Instead, along with the Queen’s father King George VI, Prince Philip ‘paced the floor’, his Private Secretary Mark Palmer said.

But Ms Searward said: ‘Eventually Parker took the Duke off for a game of squash.

”Well, time stretched a bit and he was getting restless’, Mr Parker recalled.

‘When the King’s Private Secretary Tommy Lascelles bought the good news, Philip bounded upstairs into the Buhl Room, which had been converted into an operating theatre.

‘He then held his firstborn, still wearing his sporting flannels and open-necked shirt.’

When the Princess came round from her anesthetic, the Duke of Edinburgh was there with a bottle of champagne and a large bouquet of red roses and carnations, the Queen’s favourite flowers that his equerry had the foresight to buy earlier.

According to the 2013 Netflix documentary, ‘The Royals’ when he met his first son, he declared he looked like a ‘plum pudding’.

Charles’ birth was the first royal birth since the 18th century that a British Home Secretary did not attend to verify the birth of the royal children.

The Queen, in a letter to her former music teacher, wrote after the birth: ‘The baby is very sweet, and we are enormously proud of him. He has an interesting pair of hands for a baby.

‘They are rather large, but with fine long fingers quite unlike mine and certainly unlike his father’s. It will be interesting to see what they become. I still find it hard to believe I have a baby of my own!’

The birth of the future King was said to be a boost to the morale of post-war Britain, with crowds outside the Palace chanting ‘We want Philip’.

When he did not step out on the balcony, they turned to sing lullabies instead.

Peter Phillips – 7lbs 9oz

The late Queen’s first grandchildren, Peter Phillips, was born on 15 November 1977 at St Mary’s hospital London weighing an impressive 7lbs 9oz.

 He was born to Princess Anne and her first husband Captain Mark Phillips. 

The of Peter saw a royal tradition broken, as Princess Anne declined the Queen’s offer to give Peter, and later his younger sister Zara, a royal title, meaning he would not have HRH status nor be a working royal.

It was the Queen who uncharacteristically broke the news about Peter’s birth.

She had been due to have been at an honours event at Buckingham Palace at the time, when she told guests while beaming: ‘I apologies for being late, but I have just had a message from the hospital.

‘My daughter has given birth to a son.’ 

Princess Lilibet Diana – 7lbs 11oz

Lilibet ‘Lili’ Diana Mountbatten-Windsor was born on June 4 at 11.40am at Santa Barbara Cottage Hospital in California, marking the first of the Queen’s great-grandchildren to be born after the death of Prince Philip.

Lili weighed 7lbs 11oz, almost the exact same as her cousin Mia Tindall, with the announcement of her birth being made by Meghan’s press secretary on June 6.

Buckingham Palace then released a statement later that day also confirming the birth, which read: ‘The Queen, The Prince of Wales and The Duchess of Cornwall, and The Duke and Duchess of Cambridge have been informed and are delighted with the news of the birth of a daughter for The Duke and Duchess of Sussex.’

Their daughter had been named after Queen Elizabeth, whose family nickname was Lilibet.

It was first used when Princess Elizabeth was just a toddler and unable to pronounce her own name properly. 

Mia Tindall – 7lbs 12oz

Zara and Mike Tindall’s eldest daughter Mia Grace was born on January 17 2014.

Mia was delivered on the NHS at the Gloucestershire Royal Hospital, weighing 7lbs 12oz.

New mothers who were on the same maternity ward as Zara had no idea of the extra special arrival as it was kept a secret by midwives.

Charity worker Vicky Love who gave birth to 9lbs 1oz son Isaac said: ‘I had no idea. The staff did not say anything, and it seems as though she was treated the same as the rest of us.’

Her husband Peter, a wine merchant, said: ‘It was all very normal – no armed guards, no police, nothing to suggest she was here.’

During her pregnancy, Zara opted not to know the sex of her baby and so the name of the baby was not revealed during the announcement.

Zara’s spokesperson at the time said: ‘As they opted not to know the sex of the baby, they will take some time to choose her name. Everyone is very, very happy.’ 

The statement announcing the birth added: ‘The Queen, the Duke of Edinburgh, the Princess Royal, Captain Mark Phillips and Mike’s parents, Mr Phillip and Mrs Linda Tindall, are delighted with the news.

‘This baby is the first child for Zara and Mike, the third grandchild for the Princess Royal and the fourth great-grandchild for the Queen and the Duke of Edinburgh, and is 16th line to the throne.’ 

Zara Tindall – 8lbs 1oz 

Zara Anne Elizabeth Phillips was born on May 15 1981 at St Mary’s Hospital in Paddington, London.

She weighed 8lbs 1oz gaining her unusual name from her uncle, then Prince Charles.

Recalling the birth of her daughter, Princess Anne said: ‘The baby made a rather sudden and positive arrival, and my brother thought Zara (a Greek name meaning “bright as the dawn”) was an appropriate name.’

August Brooksbank – 8lbs 1oz

August Brooksbank, the first child of Princess Eugenie and her husband Jack Brooksbank, was born on February 9 2021.

The late Queen’s ninth great grandchild was delivered at 8.55am at the Portland Hospital, the same hospital where Meghan Markle gave birth to Archie.

The luxury private hospital, where birthing packages start from £6,760 and can cost up to £20,000 and offer new parents a ‘celebration meal’ complete with champagne, lobster and foie gras.

Following the birth couple broke tradition to announce the birth, sharing a black and white photo to Eugenie’s Instagram of their baby boy, showing the couple holding his tiny hand.

This was later confirmed by Buckingham Palace announced, adding that ‘Her Royal Highness and her child are both doing well’.

Princess Charlotte – 8lbs 3oz

Princess Charlotte, third in line to the throne, was born on May 2 2015 at the Lindo Wing of St Mary’s hospital.

The baby, who was the Queen’s fifth great-grandchild, weighed 8lbs 3oz.

Days later it the baby’s full name was finally revealed, Charlotte Elizabeth Diana, in a touching nod to the Princess’ grandfather Charles, grandmother Diana and Great-Grandmother Elizabeth.

Princess Charlotte’s birth was shared on Twitter on 2 May 2015, later followed up with the traditional easel announcement. 

A statement from Kensington Palace said: ‘The Duke and Duchess are hugely grateful for the messages of congratulations they have received from people all over the world.

‘It means a great deal to them that so many people have celebrated the arrival of their new daughter.’

Prince Harry, who was in Australia on a month-long secondment at the time, said: ‘She’s absolutely beautiful. I can’t wait to meet her.’

Lucas Tindall – 8lbs 4oz

The birth of Lucas Tindall was one of the most unusual royal births to date.

Zara was forced to give birth to him on the bathroom floor of her mother, Princess Anne’s Gloucestershire Estate.

Lucas Philip Tindall was born on the bathroom of the Gatcombe Estate weighing 8lbs 4oz. 

The royal birth was unconventionally announced on Mike’s podcast The Good, The Bad and The Rugby. He told rugby legend hosts Alex Payne, James Haskell and guest Ellis Genge: ‘Sunday got even better because a little baby boy arrived at my house!’

He said the arrival of their third child caught them off guard, and left him rushing to put down a gym mat and towels because there was not enough time to get to hospital. 

Mike added there were benefits to the home birth: ‘The best thing about being at home, the best thing was, as soon as he’s wrapped up, he’s skin on skin, straight downstairs. TV room. Golf on. This is what we’re doing.’

Prince George – 8lbs 6oz

The future King, Prince George, was born on July 22 2013, weighing 8lbs 6oz.

He was born, as with his siblings, at the private Lindo Wing of St Mary’s hospital at 4.24pm.

At the time the Queen said she was ‘delighted’ with the news, while Prince Charles was overwhelmed, adding that he was ‘overjoyed’ and ‘enormously proud and happy to be a grandfather for the first time’.

Prime Minister David Cameron, who was leader at the time, said it was ‘a historic moment in the life of our nation’ but ‘above all, it’s a wonderful moment for a warm and loving couple who have got a brand-new baby boy’.

While former U.S. President Barack Obama led tributes from world leaders and said that the new baby’s birth was a ‘joyous occasion’.

His full name, which was released a few days after his birth is Prince George Alexander Louis, making him the third George from the House of Windsor to take the throne should he keep the name when he takes the crown.

Upon revealing the name, the Duke and Duchess insisted the newborn was not named after the Queen’s father, George VI, but simply because they liked the name.

Prince Louis – 8lb 7oz

Prince Louis was born on April 23 2018, at Portland Hospital weighing 8lbs 7oz – heavier than both his older siblings, Charlotte and George.

The baby, who is currently fourth in line to the throne, was born after a five-hour labour at 11.01am.

After keeping the world waiting for five days, the couple revealed their newborn son would be called Louis Arthur Charles.

The name serves as a poignant tribute to King Charles’ beloved great-uncle, mentor and ‘honorary grandfather’, Lord Mountbatten, who was killed in 1979 when the IRA placed a bomb in his fishing boat.

Savannah Phillips – 8lbs 8oz

Peter Phillips now ex-wife Autumn gave birth to their first daughter Savannah Phillips on December 29 2010 at Gloucestershire Royal Hospital, weighing 8lbs 8oz.

Her name was not immediately announced and was first revealed by accident during a public church service when the rector, Reverend Jonathan Riviere, let it slip.

In a prayer he said ‘Peter and Autumn Phillips and their daughter Savannah’ marking the first time it had been used in public.

Lena Tindall – 9lbs 3oz 

The heaviest of all royal babies born to date is Zara and Mike Tindall’s middle child and second daughter Lena Tindall.

Lena was born June 18 2019 at the Stroud Maternity Unit in Gloucestershire, weighing 9lbs 3oz. 

In an official announcement Buckingham Palace said: ‘Mrs Michael Tindall was safely delivered of a baby girl on 18th June, at Stroud Maternity Unit.

‘Mr Tindall was present at the birth. The weight of the baby was 9lbs 3oz.

‘The Queen, The Duke of Edinburgh, The Princess Royal, Captain Mark Phillips and Mike’s parents, Mr Philip and Mrs Linda Tindall, have been informed and are delighted with the news. The baby’s name will be confirmed in due course.

‘This baby is the second child for Zara and Mike, the fourth grandchild for The Princess Royal and the seventh great-grandchild for The Queen and The Duke of Edinburgh.’