Giovanna Fletcher interviewed the royal on her 'Happy Mum, Happy Baby' podcast earlier this year.
Kate has said she want the early years to be on par with other great social challenges.
Kate had pictures of her son Prince George and her husband Prince William behind her during a call.
The duke and duchess have special friendship bracelets from the children at the SOS village in Lahore.
Kate paid a visit to the University of Derby to speak to students about how the coronavirus pandemic is impacting their studies.