Kate Middleton and Jill Biden have published a joint article expressing their passionate desire to support young kids during their childhood and early years at school.
The Duchess of Cambridge and the First Lady of the United States called for a "fundamental shift" in the approach to childhood care and education.
In their opinion piece published by CNN, Kate and Dr Biden said the early years of a child's life are key for their future and expertise needs to be "at the heart of how we rebuild with boldness and purpose from the pandemic".
They wrote: "If we care about how children perform at school, how they succeed in their careers when they are older, and about their lifelong mental and physical health, then we have to care about how we are nurturing their brains, their experiences and relationships in the early years before school."
The joint article came after the pair met for the first time at Connor Downs Academy in Hayle in the county of Cornwall, where world leaders have gathered for the G7 summit.
The two women said they hoped to work together internationally on the issue with measures including conversations in families and communities about the subject, and business leaders looking at how to support parents and caregivers.
Great value should be placed on the role of mothers, fathers and caregivers as the disruption of the pandemic has helped people focus on the things that matter most, they said.
"Having been kept apart, we all value our connection to our families and loved ones in a much deeper way," they added.
Kate has previously focused on the role early childhood has on lifelong outcomes while Dr Biden is a community college educator with more than 30 years of teaching experience.
Pledging to champion this work in years to come, they wrote: "This is an agenda that should unite us all.
"We must have new conversations in our families and communities. We need CEOs to consider how they support the parents and caregivers in their workforces.
"And we need leaders across the world to understand that early childhood care and education is where they can make some of the most important, long-term impacts for their nations."
Yesterday Kate said it was a "huge honour" for her to welcome Dr Biden.
During the visit, Kate was asked about Prince Harry and Meghan Markle's daughter Lilibet.
The Duchess of Cambridge said she "can't wait" to meet the tot, who was born last week.