William, Kate and baby Prince George head Down Under
Britain's Prince William, Duke of Cambridge, and his wife Catherine, Duchess of Cambridge, arrive to attend the royal film premier of "Mandela: Long Walk to Freedom" in central London on December 5, 2013
The long flight is likely to be a challenge with the little prince, who was born on July 22 this year, although William was the same age when he first visited Australia.
His parents Prince Charles, the heir to the throne, and Diana took the young William with them on an official tour of Australia and New Zealand in March-April 1983.
William, the second in line to the throne, has been Down Under several times since then, most recently in March 2011, but it will be Kate's first visit to the region.
"The Duke and Duchess of Cambridge will visit New Zealand and Australia in April 2014" following an invitation from those countries' governments, Kensington Palace said in a statement.
"It is anticipated that Prince George will accompany Their Royal Highnesses, but a decision will be made in due course."
The couple were treated like celebrities when they visited Canada soon after their wedding in 2011, while last year they toured Singapore, Malaysia, the Solomon Islands and Tuvalu as representatives of Queen Elizabeth II on her Diamond Jubilee.
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