Prince Louis is yet to undertake one royal milestone – one already completed by his two elder siblings, Prince George and Princess Charlotte.
Prince William and Kate‘s third child, who is turning five in April, is the only child of the Prince and Princess of Wales who has not yet taken part in an overseas trip.
Prince George completed his tour, to Australia, at eight months old in 2014.
Princess Charlotte made her overseas trip debut at 16 months old, when she joined her family in Canada.
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