Duchess Kate talks about 'simple moments' she cherishes as a mother in heartfelt letter

Duchess Kate has been on maternity leave since giving birth to Prince Louis last month, but that hasn't stopped her from supporting the causes she loves.

The 36-year-old royal, who is a patron of East Anglia's Children's Hospices (EACH), wrote a letter to mark Children's Hospice Week. In the heartfelt note, she wrote about her own experiences as a mother to Louis, 4-year-old Prince George and 3-year-old Princess Charlotte.

"By supporting Children's Hospice Week we can help them spread joy and positivity across the UK, encouraging everyone to make the most of moments that matter." the duchess wrote. "Spending quality time together is such an important aspect of family life and for me, as a mother, it is the simple family moments like playing outside together that I cherish."

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Prince George and Princess Charlotte steal the show at royal wedding
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Prince George and Princess Charlotte steal the show at royal wedding
WINDSOR, UNITED KINGDOM - MAY 19: Princess Charlotte leaves St George's Chapel at Windsor Castle after the wedding of Prince Harry, Duke of Sussex and Meghan Markle on May 19, 2018 in Windsor, England. (Photo by Brian Lawless - WPA Pool/Getty Images)
WINDSOR, UNITED KINGDOM - MAY 19: Princess Charlotte and Catherine, Duchess of Cambridge leave St George's Chapel at Windsor Castle after the wedding of Prince Harry, Duke of Sussex and Meghan Markle on May 19, 2018 in Windsor, England. (Photo by Brian Lawless - WPA Pool/Getty Images)
Doria Ragland, the Prince of Wales, the Duchess of Cornwall, the Duke and Duchess of Cambridge with Prince George and Princess Charlotte leave St George's Chapel in Windsor Castle after the wedding.
Princess Charlotte (L) waves by her mother Britain's Catherine, Duchess of Cambridge after attending the wedding ceremony of Britain's Prince Harry, Duke of Sussex and US actress Meghan Markle at St George's Chapel, Windsor Castle, in Windsor, on May 19, 2018. (Photo by Jane Barlow / POOL / AFP) (Photo credit should read JANE BARLOW/AFP/Getty Images)
WINDSOR, UNITED KINGDOM - MAY 19: Prince George leaves St George's Chapel at Windsor Castle after the wedding of Prince Harry, Duke of Sussex and Meghan Markle on May 19, 2018 in Windsor, England. (Photo by Brian Lawless - WPA Pool/Getty Images)
WINDSOR, UNITED KINGDOM - MAY 19: Princess Charlotte and Prince William, Duke of Cambridge leave St George's Chapel after the wedding of Prince Harry and Meghan Markle in St George's Chapel at Windsor Castle on May 19, 2018 in Windsor, England. (Photo by Jane Barlow - WPA Pool/Getty Images)
WINDSOR, ENGLAND - MAY 19: Princess Charlotte of Cambridge arrives at the wedding of Prince Harry to Ms Meghan Markle at St George's Chapel, Windsor Castle on May 19, 2018 in Windsor, England. (Photo by Chris Jackson/Getty Images)
Princess Charlotte (right) arrives for the wedding of Prince Harry and Meghan Markle at Windsor Castle.
Princess Charlotte on the steps of St George's Chapel in Windsor Castle after the wedding of Prince Harry and Meghan Markle in Windsor, Britain, May 19, 2018. Jane Barlow/Pool via REUTERS
Princess Charlotte of Cambridge (L) stands on the steps holding the hand of her mother Britain's Catherine, Duchess of Cambridge, (R) after attending the wedding ceremony of Britain's Prince Harry, Duke of Sussex and US actress Meghan Markle at St George's Chapel, Windsor Castle, in Windsor, on May 19, 2018. (Photo by Jane Barlow / POOL / AFP) (Photo credit should read JANE BARLOW/AFP/Getty Images)
Princess Charlotte of Cambridge (L) waves holding the hand of her mother Britain's Catherine, Duchess of Cambridge, (R) after attending the wedding ceremony of Britain's Prince Harry, Duke of Sussex and US actress Meghan Markle at St George's Chapel, Windsor Castle, in Windsor, on May 19, 2018. (Photo by Jane Barlow / POOL / AFP) (Photo credit should read JANE BARLOW/AFP/Getty Images)
Britain's Catherine, Duchess of Cambridge (L) and Meghan Markle's friend, Canadian fashion stylist Jessica Mulroney (2L) hold bridesmaids hands as they arrive for the wedding ceremony of Britain's Prince Harry, Duke of Sussex and US actress Meghan Markle at St George's Chapel, Windsor Castle, in Windsor, on May 19, 2018. (Photo by Jane Barlow / POOL / AFP) (Photo credit should read JANE BARLOW/AFP/Getty Images)
The Duchess of Cambridge arrives with the Princess Charlotte (right) at St George's Chapel at Windsor Castle for the wedding of Prince Harry and Meghan Markle.
Duchess of Cambridge and Princess Charlotte after the wedding of Prince Harry and Meghan Markle at Windsor Castle.
The Duke and Duchess of Cambridge and Prince George leave St George's Chapel at Windsor Castle for the wedding of Meghan Markle and Prince Harry.
Britain's Catherine, Duchess of Cambridge (C) walks up the west steps with Prince George (L) and bridesmaids for the wedding ceremony of Britain's Prince Harry, Duke of Sussex and US actress Meghan Markle at St George's Chapel, Windsor Castle, in Windsor, on May 19, 2018. (Photo by Jane Barlow / POOL / AFP) (Photo credit should read JANE BARLOW/AFP/Getty Images)
Prince Harry's brother and best man Prince William, Duke of Cambridge, Britain's Catherine, Duchess of Cambridge, and Prince Harry's nephew and page boy Prince George leave after attending the wedding ceremony of Britain's Prince Harry, Duke of Sussex and US actress Meghan Markle at St George's Chapel, Windsor Castle, in Windsor, on May 19, 2018. (Photo by Gareth Fuller / POOL / AFP) (Photo credit should read GARETH FULLER/AFP/Getty Images)
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She continued: "I hope you will join me in supporting Children's Hospice Week this year. Together we can champion the vital role that children's hospices play in helping seriously ill children and families to have more precious moments."

For Children's Hospice Week in 2016, the Duchess of Cambridge released a video of support. She took on the patronage of EACH back in 2012.

This past weekend, Kate made her first public appearance since giving birth at Prince Harry and Meghan Markle's wedding. The royal stunned in an Alexander McQueen ensemble that she's worn on two previous occasions. For more on Kate, watch the video above.

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Duchess Kate gives birth to baby No. 3! All the photos from the big day
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Duchess Kate gives birth to baby No. 3! All the photos from the big day
Britain's Prince William, Duke of Cambridge (L) and Britain's Catherine, Duchess of Cambridge show their newly-born son, their third child, to the media outside the Lindo Wing at St Mary's Hospital in central London, on April 23, 2018. (Photo by Daniel LEAL-OLIVAS / AFP) (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)
LONDON, ENGLAND - APRIL 23: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge depart the Lindo Wing with their newborn son at St Mary's Hospital on April 23, 2018 in London, England. The Duchess safely delivered a son at 11:01 am, weighing 8lbs 7oz, who will be fifth in line to the throne. (Photo by Karwai Tang/WireImage)
LONDON, ENGLAND - APRIL 23: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge depart the Lindo Wing with their newborn son at St Mary's Hospital on April 23, 2018 in London, England. The Duchess safely delivered a boy at 11:01 am, weighing 8lbs 7oz, who will be fifth in line to the throne. (Photo by Samir Hussein/WireImage)
The Duke and Duchess of Cambridge and their newborn son outside the Lindo Wing at St Mary's Hospital in Paddington, London. (Photo by John Stillwell/PA Images via Getty Images)
LONDON, ENGLAND - APRIL 23: Catherine, Duchess of Cambridge departs the Lindo Wing with her newborn son at St Mary's Hospital on April 23, 2018 in London, England. The Duchess safely delivered a boy at 11:01 am, weighing 8lbs 7oz, who will be fifth in line to the throne. (Photo by Chris Jackson/Getty Images)
Britain's Catherine, Duchess of Cambridge holds her newly-born son as he's presented to the press outside the Lindo Wing at St Mary's Hospital in central London, on April 23, 2018. (Photo by Daniel LEAL-OLIVAS / AFP) (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)
Britain's Prince William, Duke of Cambridge and Britain's Catherine, Duchess of Cambridge show their newly-born son, their third child, to the media outside the Lindo Wing at St Mary's Hospital in central London, on April 23, 2018. Photo by Daniel LEAL-OLIVAS / AFP 
Britain's Prince William, Duke of Cambridge and Britain's Catherine, Duchess of Cambridge show their newly-born son, their third child, to the media outside the Lindo Wing at St Mary's Hospital in central London, on April 23, 2018. (Photo by Daniel LEAL-OLIVAS / AFP) 
The newborn son of Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge as they depart the Lindo Wing at St Mary's Hospital on April 23, 2018 in London, England. The Duchess safely delivered a boy at 11:01 am, weighing 8lbs 7oz, who will be fifth in line to the throne. (Photo by Chris Jackson/Getty Images)
The newborn son of Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge as they depart the Lindo Wing at St Mary's Hospital on April 23, 2018 in London, England. The Duchess safely delivered a boy at 11:01 am, weighing 8lbs 7oz, who will be fifth in line to the throne. (Photo by Chris Jackson/Getty Images)
Britain's Prince William, Duke of Cambridge and Britain's Catherine, Duchess of Cambridge show their newly-born son, their third child, to the media outside the Lindo Wing at St Mary's Hospital in central London, on April 23, 2018. (Photo by DANIEL LEAL-OLIVAS / AFP) 
The Duchess of Cambridge with her newborn son outside the Lindo Wing at St Mary's Hospital in Paddington, London. (Photo by John Stillwell/PA Images via Getty Images)
Britain's Prince William, Duke of Cambridge and Britain's Catherine, Duchess of Cambridge show their newly-born son, their third child, to the media outside the Lindo Wing at St Mary's Hospital in central London, on April 23, 2018. (Photo by Isabel INFANTES / AFP)
The Duchess of Cambridge and her newborn son outside the Lindo Wing at St Mary's Hospital in Paddington, London. (Photo by Dominic Lipinski/PA Images via Getty Images)
Britain's Prince William, Duke of Cambridge and Britain's Catherine, Duchess of Cambridge show their newly-born son, their third child, to the media outside the Lindo Wing at St Mary's Hospital in central London, on April 23, 2018. (Photo by Ben STANSALL / AFP) (Photo credit should read BEN STANSALL/AFP/Getty Images)
Britain's Prince William, Duke of Cambridge and Britain's Catherine, Duchess of Cambridge (R) show their newly-born son, their third child, to the media outside the Lindo Wing at St Mary's Hospital in central London, on April 23, 2018. (Photo by Ben STANSALL / AFP) 
Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge depart the Lindo Wing with their newborn son at St Mary's Hospital on April 23, 2018 in London, England. The Duchess safely delivered a son at 11:01 am, weighing 8lbs 7oz, who will be fifth in line to the throne. (Photo by Mike Marsland/Mike Marsland/ WireImage)
Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge depart the Lindo Wing with their newborn son at St Mary's Hospital on April 23, 2018 in London, England. The Duchess safely delivered a son at 11:01 am, weighing 8lbs 7oz, who will be fifth in line to the throne. (Photo by Mike Marsland/Mike Marsland/ WireImage)
Britain's Prince William arrives at the Lindo Wing of St Mary's Hospital with his children Prince George and Princess Charlotte after his wife Catherine, the Duchess of Cambridge, gave birth to a son, in London, April 23, 2018. (REUTERS/Henry Nicholls)
LONDON, ENGLAND - APRIL 23: Prince William, Duke of Cambridge arrives with Prince George and Princess Charlotte at the Lindo Wing after Catherine, Duchess of Cambridge gave birth to their son at St Mary's Hospital on April 23, 2018 in London, England. The Duchess safely delivered a boy at 11:01 am, weighing 8lbs 7oz, who will be fifth in line to the throne. (Photo by Steve Back/Getty Images)
Princess Charlotte of Cambridge (L) turns to wave at the media as she is led in with her brother Prince George of Cambridge (R) by their father Britain's Prince William, Duke of Cambridge, (C) at the Lindo Wing of St Mary's Hospital in central London, on April 23, 2018, to visit Catherine, Duchess of Cambridge, and their new-born brother, the Duke and Duchess's third child. - Kate, the wife of Britain's Prince William, has given birth to a baby son, Kensington Palace announced Monday. 'Her Royal Highness The Duchess of Cambridge was safely delivered of a son at 11:01 (1001 GMT),' the palace said in a statement. The baby boy weighs eight pounds and seven ounces (3.8 kilogrammes). (Photo by Ben STANSALL / AFP) (Photo credit should read BEN STANSALL/AFP/Getty Images)
LONDON, ENGLAND - APRIL 23: Prince William, Duke of Cambridge and Princess Charlotte arrive with Prince George at the Lindo Wing after the birth of his third child on April 23, 2018 in London, England. The Duchess of Cambridge gave birth to a boy at 11:01 BST, weighing 8lb 7oz. (Photo by Neil Mockford/GC Images)
LONDON, ENGLAND - APRIL 23: Prince William, Duke of Cambridge, Prince George and Princess Charlotte arrive at the Lindo Wing after the birth of his third child on April 23, 2018 in London, England. The Duchess of Cambridge gave birth to a boy at 11:01 BST, weighing 8lb 7oz. (Photo by Neil Mockford/GC Images)
Princess Charlotte of Cambridge (L) turns to wave at the media as she is led in with her brother Prince George of Cambridge (R) by their father Britain's Prince William, Duke of Cambridge, (C) at the Lindo Wing of St Mary's Hospital in central London, on April 23, 2018, to visit Catherine, Duchess of Cambridge, and their new-born brother, the Duke and Duchess's third child. - Kate, the wife of Britain's Prince William, has given birth to a baby son, Kensington Palace announced Monday. 'Her Royal Highness The Duchess of Cambridge was safely delivered of a son at 11:01 (1001 GMT),' the palace said in a statement. The baby boy weighs eight pounds and seven ounces (3.8 kilogrammes). (Photo by Ben STANSALL / AFP) (Photo credit should read BEN STANSALL/AFP/Getty Images)
LONDON, ENGLAND - APRIL 23: Prince William, Duke of Cambridge arrives with Prince George and Princess Charlotte at the Lindo Wing after Catherine, Duchess of Cambridge gave birth to their son at St Mary's Hospital on April 23, 2018 in London, England. The Duchess safely delivered a boy at 11:01 am, weighing 8lbs 7oz, who will be fifth in line to the throne. (Photo by Chris Jackson/Getty Images)
Britain's Prince William, Duke of Cambridge, gives a wave as he leaves the Lindo Wing at St Mary's Hospital in central London, on April 23, 2018, after his wife Britain's Catherine, Duchess of Cambridge, gave birth to a son, their third child. - Kate, the wife of Britain's Prince William, has given birth to a baby son, Kensington Palace announced Monday. 'Her Royal Highness The Duchess of Cambridge was safely delivered of a son at 11:01 (1001 GMT),' the palace said in a statement. The baby boy weighs eight pounds and seven ounces (3.8 kilogrammes). (Photo by Ben STANSALL / AFP) (Photo credit should read BEN STANSALL/AFP/Getty Images)
Britain's Prince William, Duke of Cambridge, gives a wave as he leaves the Lindo Wing at St Mary's Hospital in central London, on April 23, 2018, after his wife Britain's Catherine, Duchess of Cambridge, gave birth to a son, their third child. - Kate, the wife of Britain's Prince William, has given birth to a baby son, Kensington Palace announced Monday. 'Her Royal Highness The Duchess of Cambridge was safely delivered of a son at 11:01 (1001 GMT),' the palace said in a statement. The baby boy weighs eight pounds and seven ounces (3.8 kilogrammes). (Photo by Ben STANSALL / AFP) (Photo credit should read BEN STANSALL/AFP/Getty Images)
Britain's Prince William, Duke of Cambridge, gives a wave as he leaves the Lindo Wing at St Mary's Hospital in central London, on April 23, 2018, after his wife Britain's Catherine, Duchess of Cambridge, gave birth to a son, their third child. - Kate, the wife of Britain's Prince William, has given birth to a baby son, Kensington Palace announced Monday. 'Her Royal Highness The Duchess of Cambridge was safely delivered of a son at 11:01 (1001 GMT),' the palace said in a statement. The baby boy weighs eight pounds and seven ounces (3.8 kilogrammes). (Photo by Ben STANSALL / AFP) (Photo credit should read BEN STANSALL/AFP/Getty Images)
Britain's Prince William, Duke of Cambridge, gives a wave as he leaves the Lindo Wing at St Mary's Hospital in central London, on April 23, 2018, after his wife Britain's Catherine, Duchess of Cambridge, gave birth to a son, their third child. - Kate, the wife of Britain's Prince William, has given birth to a baby son, Kensington Palace announced Monday. 'Her Royal Highness The Duchess of Cambridge was safely delivered of a son at 11:01 (1001 GMT),' the palace said in a statement. The baby boy weighs eight pounds and seven ounces (3.8 kilogrammes). (Photo by Ben STANSALL / AFP) (Photo credit should read BEN STANSALL/AFP/Getty Images)
Britain's Prince William, Duke of Cambridge, gives a wave as he leaves the Lindo Wing at St Mary's Hospital in central London, on April 23, 2018, after his wife Britain's Catherine, Duchess of Cambridge, gave birth to a son, their third child. - Kate, the wife of Britain's Prince William, has given birth to a baby son, Kensington Palace announced Monday. 'Her Royal Highness The Duchess of Cambridge was safely delivered of a son at 11:01 (1001 GMT),' the palace said in a statement. The baby boy weighs eight pounds and seven ounces (3.8 kilogrammes). (Photo by Isabel INFANTES / AFP) (Photo credit should read ISABEL INFANTES/AFP/Getty Images)
LONDON, ENGLAND - APRIL 23: Tourists and photographers take pictures of a notice placed on an easel in the forecourt of Buckingham Palace in London to formally announce the birth of a baby boy to the Duke and Duchess of Cambridge at the Lindo Wing of St Mary's Hospital on April 23, 2018 in London, England. The Duchess safely delivered a son at 11:01 am, weighing 8lbs 7oz, who will be fifth in line to the throne. (Photo by Stefan Rousseau - WPA Pool/Getty Images)
LONDON, ENGLAND - APRIL 23: A notice is placed on an easel in the forecourt of Buckingham Palace in London to formally announce the birth of a baby boy to the Duke and Duchess of Cambridge at the Lindo Wing of St Mary's Hospital on April 23, 2018 in London, England. The Duchess safely delivered a son at 11:01 am, weighing 8lbs 7oz, who will be fifth in line to the throne. (Photo by Stefan Rousseau - WPA Pool/Getty Images)
A Royal bulletin, announcing that Britain's Catherine, Duchess of Cambridge, the wife of Britain's Prince William, has given birth to a baby boy, stands on an easel on the forecourt of Buckingham Palace in London on April 23, 2018. - Kate, the wife of Britain's Prince William, has given birth to a baby son, Kensington Palace announced Monday. 'Her Royal Highness The Duchess of Cambridge was safely delivered of a son at 11:01 (1001 GMT),' the palace said in a statement. The baby boy weighs eight pounds and seven ounces (3.8 kilogrammes). (Photo by Stefan Rousseau / POOL / AFP) (Photo credit should read STEFAN ROUSSEAU/AFP/Getty Images)
Palace staff position a Royal bulletin, announcing that Britain's Catherine, Duchess of Cambridge, the wife of Britain's Prince William, has given birth to a baby boy, on an easel on the forecourt of Buckingham Palace in London on April 23, 2018. - Kate, the wife of Britain's Prince William, has given birth to a baby son, Kensington Palace announced Monday. 'Her Royal Highness The Duchess of Cambridge was safely delivered of a son at 11:01 (1001 GMT),' the palace said in a statement. The baby boy weighs eight pounds and seven ounces (3.8 kilogrammes). (Photo by Daniel SORABJI / AFP) (Photo credit should read DANIEL SORABJI/AFP/Getty Images)
A Royal bulletin, announcing that Britain's Catherine, Duchess of Cambridge, the wife of Britain's Prince William, has given birth to a baby boy, stands on an easel on the forecourt of Buckingham Palace in London on April 23, 2018. - Kate, the wife of Britain's Prince William, has given birth to a baby son, Kensington Palace announced Monday. 'Her Royal Highness The Duchess of Cambridge was safely delivered of a son at 11:01 (1001 GMT),' the palace said in a statement. The baby boy weighs eight pounds and seven ounces (3.8 kilogrammes). (Photo by Stefan Rousseau / POOL / AFP) (Photo credit should read STEFAN ROUSSEAU/AFP/Getty Images)
Camera crews prepare outside the Lindo Wing at St Mary's Hospital in central London where Britain's Catherine, Duchess of Cambridge gave birth to a baby boy on April 23, 2018. (Photo by Daniel LEAL-OLIVAS / AFP) (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)
Royal fans celebrate the news that Britain's Catherine, Duchess of Cambridge gave birth to a baby boy outside the Lindo Wing at St Mary's Hospital in central London, on April 23, 2018. (Photo by Isabel INFANTES / AFP) (Photo credit should read ISABEL INFANTES/AFP/Getty Images)
A town crier announces the news of the birth of a baby boy by Britain's Catherine, Duchess of Cambridge outside the Lindo Wing at St Mary's Hospital in central London, on April 23, 2018. (Photo by Ben STANSALL / AFP) (Photo credit should read BEN STANSALL/AFP/Getty Images)
A town crier outside the Lindo Wing at St Mary's Hospital in Paddington, London, after the news that the Duchess of Cambridge has given birth to a son. (Photo by Kirsty O'Connor/PA Images via Getty Images)
LONDON, ENGLAND - APRIL 23: A town crier announces that the Duchess of Cambridge has given birth to a baby boy at St Mary's Hospital on April 23, 2018 in London, England. The Duke and Duchess of Cambridge's third child was born this morning at 11:01, weighing 8lbs 7oz. (Photo by Jack Taylor/Getty Images)
LONDON, ENGLAND - APRIL 23: A town crier announces the birth of the new prince on the steps of the Lindo Wing on April 23, 2018 in London, England. (Photo by Neil Mockford/GC Images)
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