The royal couple will visit the offices of Child Bereavement UK at the Clare Charity Centre in Saunderton, Buckinghamshire on March 19, St. James's Palace has announced.
The Duke and Duchess of Cambridge will meet staff from the charity's bereavement services as well as its training and fundraising teams.
The parents-to-be will then be introduced to bereaved families involved in the charity's services.
The charity supports families and educates professionals when a baby or child of any age dies or is dying, or when a child is facing bereavement.
Prince William is a patron of the charity.