Kate's baby set to earn royals a princely sum in souvenir sales Royals are all smiles as they are set to reap a sales boom with the impending birth of Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge's baby in July. Photo: Chris Jackson/Getty Images Source: Getty Images THE royal family is set to cash in as the impending birth of Prince William and Kate Middleton's baby kickstarts a $A165 million souvenirs bonanza. Her Majesty's palace shops will sell baby clothes and souvenirs celebrating the latest arrival in the Windsor family, due on July 13. All profits will go to the Royal Collection Trust which is used for the upkeep of palaces and art, The Sun reports. Prince Charles is also set to profit with handmade baby shoes going on sale in his Highgrove shop. Even the Duchess of Cambridge's parents, Carole and Michael Middleton, have added a "baby arrival" range to their Party Pieces website. The Centre for Retail Research has published a study into the effect of the royal baby on trading. Apart from the obvious interest in souvenirs, books and DVDs, it expects sales of prams and pushchairs to rise by 13% as new parents "trade up" to more exclusive baby carriages, following a trend that is expected to be set by the royals. Read more at The Sun.