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LONDON, ENGLAND - JANUARY 11: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge listen during a meeting with professionals at the Child Bereavement UK Centre in Stratford on January 11, 2017 in London, England. (Photo by Matt Dunham - WPA Pool/ Getty Images)

LONDON, ENGLAND - JANUARY 11:  Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge listen during a meeting with professionals at the Child Bereavement UK Centre in Stratford on January 11, 2017 in London, England.  (Photo by Matt Dunham - WPA Pool/ Getty Images)

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LONDON, ENGLAND - JANUARY 11: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge listen to people as they arrive at the Child Bereavement UK Centre in Stratford on January 11, 2017 in London, England. (Photo by Matt Dunham - WPA Pool/ Getty Images)

LONDON, ENGLAND - JANUARY 11:  Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge listen to people as they arrive at the Child Bereavement UK Centre in Stratford on January 11, 2017 in London, England.  (Photo by Matt Dunham - WPA Pool/ Getty Images)

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LONDON, ENGLAND - JANUARY 11: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge prepare to cut a cake to celebrate the one year anniversary of this charity's branch, during his visit to a Child Bereavement UK Centre in Stratford on January 11, 2017 in London, England. (Photo by Matt Dunham - WPA Pool/ Getty Images)

LONDON, ENGLAND - JANUARY 11: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge prepare to cut a cake to celebrate the one year anniversary of this charity's branch, during his visit to a Child Bereavement UK Centre in Stratford on January 11, 2017 in London, England.  (Photo by Matt Dunham - WPA Pool/ Getty Images)

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LONDON, ENGLAND - JANUARY 11: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge prepare to cut a cake to celebrate the one year anniversary of this charity's branch, during his visit to a Child Bereavement UK Centre in Stratford on January 11, 2017 in London, England. (Photo by Matt Dunham - WPA Pool/ Getty Images)

LONDON, ENGLAND - JANUARY 11: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge prepare to cut a cake to celebrate the one year anniversary of this charity's branch, during his visit to a Child Bereavement UK Centre in Stratford on January 11, 2017 in London, England.  (Photo by Matt Dunham - WPA Pool/ Getty Images)

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LONDON, ENGLAND - JANUARY 11: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge prepare to cut a cake to celebrate the one year anniversary of this charity's branch, during his visit to a Child Bereavement UK Centre in Stratford on January 11, 2017 in London, England. (Photo by Matt Dunham - WPA Pool/ Getty Images)

LONDON, ENGLAND - JANUARY 11: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge prepare to cut a cake to celebrate the one year anniversary of this charity's branch, during his visit to a Child Bereavement UK Centre in Stratford on January 11, 2017 in London, England.  (Photo by Matt Dunham - WPA Pool/ Getty Images)