The children will sometimes delight royal fans with appearances at events such as the royal Christmas Day service or Trooping the Colour.
When appearing in public, Kate’s interactions with her children have given clues of her parenting style.
She uses a technique which seems to encourage the independence of her children, body language expert Judi James suggested.
The expert told Express.co.uk: “Kate obviously finds it important to create a four (and now five) strong unit.
“Her attention and bonding techniques seem to involve bending to the child’s height to communicate, which might suggest a desire to grow their confidence by tuning into them to make them feel more grown-up and independent.”
Judi claimed the mother of three has a parenting style that aims to grow the confidence of her children.
This is something that seems to be important to Kate and she has encouraged their independence during a number of events.
Judi continued: “Kate uses a face-gazing technique with Charlotte, with her wide smile of delight showing she’s also totally besotted.
The Duchess of Cambridge and Prince William seem to be aligned in their parenting and Judi explained they have a united front.
She continued: “Kate has used coordinated colours to emphasise the feeling of a strong unit, although their clothing styles all project individuality.
“Rather than bunching around her children she’s opted for a ‘paper doll’ line-up with William very much part of the group.”
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How did Kate Middleton become a royal?
Kate Middleton, or Catherine, Duchess of Cambridge, was born on 9 January 1982 at the Royal Berkshire Hospital, Reading, England.
She was born to Michael and Carole Middleton, a former flight dispatcher and air hostess. The couple founded a party supplies company, Party Pieces, in 1987 – now estimated to be worth £30 million.
Kate has a younger sister Pippa Matthews, 34, and a younger brother James Middleton, 31.
Kate and her family moved to Amman, Jordan, in 1984, where the future Duchess was educated at an English-speaking nursery school.
After moving back to Berkshire the family sent Kate to private school, St Andrews School. She went on to briefly study at Downe House before moving onto Marlborough College where she boarded.
For university the young Kate attended the University of St Andrews in Fife, Scotland. Here she was awarded an undergraduate MA (2:1 Hons) in history of art.
Relationship with Prince William
Kate met Prince William when they were both studying at St Andrews, and both living in St Salvator’s Hall. Famously, William reportedly took a fancy to Kate after she wore a see-through dress during a fashion show.
In 2003 the couple began dating and lived together during their second year of university.
The couple split in April 2007, however, in October they were back together.
Prince William proposed to Kate Middleton with his late mother Princess Diana’s engagement ring in October 2010. The couple were holidaying in Kenya at the time.
On 29 April 2011 they married at Westminster Abbey with a whopping 26 million watching the event live.
Kate wore an Alexander McQueen dress worth a reported £250,000 on the big day.
Kate assumed the title “Her Royal Highness The Duchess of Cambridge” and also became the Duchess of Cambridge on the day.