Prince George and Princess Charlotte will travel with the Duke and Duchess of Cambridge on a tour of Germany and Poland this month, Kensington Palace has said.
The five-day tour, which begins on July 17 in the Polish capital, Warsaw, will see the royals take part in a rowing race, visit the former Stutthof Nazi Concentration Camp and meet with German Chancellor Angela Merkel.
William and Kate have taken their children, George aged three and two-year-old Charlotte, on an official tour before, travelling to Canada with them last year where they enjoyed an open-air party for youngsters, and in 2014 their toddler prince flew with them to New Zealand and Australia.
However, during the tour of Poland and Germany the children are likely to be seen only during arrivals and departures.
A Kensington Palace spokesman said: "The Duke and Duchess are very much looking forward to this tour and are delighted with the exciting and varied programme that has been put together for it.
"They have decided that their children, Prince George and Princess Charlotte, will travel with them and we expect the children to be seen on at least a couple of occasions over the course of the week."
During the tour, the royals will also visit the Warsaw Rising Museum and the Berlin Holocaust Memorial, meeting survivors of the period at each location.
The tour, which ends in the German city of Hamburg on July 21, will also include:
- a visit to the port city of Gdansk
- a tour of Hamburg's Elbphilharmonie Concert Hall
- a visit to the Brandenburg Gate in Berlin
The Cambridges are making the trip at the request of the Foreign and Commonwealth Office.
Kensington Palace said that as well as meeting business, government and civil society leaders, the Duke and Duchess will "pay special attention to getting to known the young people of Poland and Germany", including mental health campaigners and entrepreneurs.
"They look forward to a busy and impactful tour, and are grateful that they will have the opportunity to meet the Polish and German people - such important friends of the United Kingdom - as a family," Kensington Palace said.