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LONDON, ENGLAND - JANUARY 11: Catherine, Duchess of Cambridge speaks with staff and guests at the Early Years Parenting Unit (EYPU) of the Anna Freud National Centre for Children and Families in north London on January 11, 2017 in London, England. (Photo by Ben Stansall - WPA Pool/ Getty Images)

LONDON, ENGLAND - JANUARY 11:  Catherine, Duchess of Cambridge speaks with staff and guests at the Early Years Parenting Unit (EYPU) of the Anna Freud National Centre for Children and Families in north London on January 11, 2017 in London, England.  (Photo by Ben Stansall - WPA Pool/ Getty Images)

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LONDON, ENGLAND - JANUARY 11: Catherine, Duchess of Cambridge meets attendees at the Early Years Parenting Unit (EYPU) of the Anna Freud National Centre for Children and Families in north London on January 11, 2017 in London, England. (Photo by Ben Stansall - WPA Pool/ Getty Images)

LONDON, ENGLAND - JANUARY 11:  Catherine, Duchess of Cambridge meets attendees at  the Early Years Parenting Unit (EYPU) of the Anna Freud National Centre for Children and Families in north London on January 11, 2017 in London, England.  (Photo by Ben Stansall - WPA Pool/ Getty Images)

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LONDON, ENGLAND - JANUARY 11: Catherine, Duchess of Cambridge speaks with staff and guests at the Early Years Parenting Unit (EYPU) of the Anna Freud National Centre for Children and Families in north London on January 11, 2017 in London, England. (Photo by Ben Stansall - WPA Pool/ Getty Images)

LONDON, ENGLAND - JANUARY 11:  Catherine, Duchess of Cambridge speaks with staff and guests at the Early Years Parenting Unit (EYPU) of the Anna Freud National Centre for Children and Families in north London on January 11, 2017 in London, England.  (Photo by Ben Stansall - WPA Pool/ Getty Images)

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LONDON, ENGLAND - JANUARY 11: Catherine, Duchess of Cambridge meets attendees at the Early Years Parenting Unit (EYPU) of the Anna Freud National Centre for Children and Families in north London on January 11, 2017 in London, England. (Photo by Ben Stansall - WPA Pool/ Getty Images)

LONDON, ENGLAND - JANUARY 11:  Catherine, Duchess of Cambridge meets attendees at  the Early Years Parenting Unit (EYPU) of the Anna Freud National Centre for Children and Families in north London on January 11, 2017 in London, England.  (Photo by Ben Stansall - WPA Pool/ Getty Images)

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LONDON, ENGLAND - JANUARY 11: Catherine, Duchess of Cambridge meets attendees at the Early Years Parenting Unit (EYPU) of the Anna Freud National Centre for Children and Families in north London on January 11, 2017 in London, England. (Photo by Ben Stansall - WPA Pool/ Getty Images)

LONDON, ENGLAND - JANUARY 11:  Catherine, Duchess of Cambridge meets attendees at  the Early Years Parenting Unit (EYPU) of the Anna Freud National Centre for Children and Families in north London on January 11, 2017 in London, England.  (Photo by Ben Stansall - WPA Pool/ Getty Images)