In a speech at an event for Place2Be, the Duchess of Cambridge Kate Middleton said schools and parents must work together to help children thrive.
Prince Harry is expected to propose to the Suits actress imminently.
Duchess of Cambridge, 35, is glowing as she is pregnant with her third child. Young people's mental health is a key priority for the Duchess of Cambridge.
While the news is disheartening for royal watchers, it follows previous speculations of a late November engagement, after the Queen and Prince Philip's Platinum Anniversary.
Kate Middleton hosted a reception at Kensington Palace, which was held in honour of The Anna Freud National Centre for Children and Families.
Prince Charles lobbied on climate policy without disclosing his private estate's $113,500 investment in an offshore firm that could have benefited from a rule change.
LA-born Markle, 36, is expected to join boyfriend of 18 months Prince Harry in London sometime this month to pursue humanitarian causes.
Royal wedding experts predict where Harry and his Suits actress girlfriend will get married - and why.
An engagement between Suits actress Markle and Prince Harry is thought to be "imminent" after an 18-month romance and a meeting with the Queen in October.
Duchess of Cambridge was in high spirits and appeared energetic for her first solo engagement since announcing her third pregnancy on 4 September.
Prince William praised a five-year-old girl who saved her mum's life by calling 999. The 35-year-old royal told the girl he would teach Prince George how to do the same.
The Duke and Duchess of Cambridge and Prince Harry have applied to trademark #stopspeaksupport to raise awareness of mental health issues on social media.
The media continue to dig around the Suits actress' background as the couple have announced their engagement.
Isis' latest threat involving the four-year-old prince has sparked a social media outcry.
The Channel 4 documentary When Harry Met Meghan Markle reveals why Prince Harry believes the Suits star could handle the pressures that come with a royal romance.