Prince William and his wife Kate, joined by Prince George, will arrive in Wellington, New Zealand on April 7 for a three-week trip ending in the Australian capital Canberra on April 25, the couple's office said in a statement on Sunday.
With his parents keen to shield him from too much media intrusion, the world has had few glimpses of third-in-line to the throne since his birth in July last year.
The trip, Kate's first visit to both countries, will see the young prince follow in the footsteps of his father William, who at the age of 9 months accompanied his parents on an official tour of Australia and New Zealand in March and April 1983.
A spokesperson for the royal couple, known officially as the Duke and Duchess of Cambridge, said a nanny would be joining them on the trip.
The tour will include events to celebrate Australia and New Zealand's success in technology, tourism, sports and art, the couple's office said, along with ceremonies to commemorate the one-hundredth anniversary of the start of World War One.
(Reporting by Kylie MacLellan; Editing by Tom Heneghan)