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The Duke and Duchess recently moved from a two-bedroom cottage at Kensingon Palace to Frogmore Cottage in Windsor, with a source telling the Daily Mail "it is standard procedure for royals living outside the capital".
The post also quoted a poem, Lands, by Nayyirah Waheed: "My mother was my first country; The first place I ever lived". The image's backdrop is full of forget-me-nots: Princess Diana's favorite flower.
Kate added: "We're looking forward to meeting him. these next few weeks are always a bit daunting the first time round so we wish them all the best".
Following Archie Harrison Mountbatten-Windsor's name announcement, many wondered why the royal baby doesn't have an official title like his cousins, Prince George, Princess Charlotte, and Prince Louis.
When his grandfather, Charles, becomes king, Archie will automatically become a prince, although he - or his parents - may choose to not use that title, either.
Does this mean that Meghan Markle, an American who joined the British royal family, will get to celebrate two Mother's Days per year? Wow. They shared a home there for almost two years while Harry had been living at the property, next door to Kate and William, for a number of years previous.
The picture of Archie - who was described as "to die for" by his beaming father after his birth last Monday - was posted on Instagram to mark Mother's Day, which was celebrated in Meghan's native United States, six weeks after Britain.
And even the caption alluded to Diana as mother who is "lost but forever remembered".
Little Archie Harrison appears to be wrapped in the same shawl he was first introduced to the public in.
Archie is seventh in line to throne and is the Queen's eighth great-grandchild.
"He's very joyful, same as his brother, same as his dad, so I think he's just got that from his family".