The Queen and Duke of Edinburgh are to miss Prince Louis of Cambridge's christening, Buckingham Palace has confirmed.
The decision is understood not to have been taken on health grounds, and to have been mutually agreed by the Queen and the Cambridges some time ago.
The monarch, 92, has a busy week ahead, with high-profile celebrations in central London marking the centenary of the RAF on Tuesday, and a visit by US President Donald Trump in Windsor on Friday.
The Duke of Edinburgh, 97, has retired from public duties and has been enjoying his free time away from London.
Louis, the 11-week-old youngest son of the Duke and Duchess of Cambridge, is being baptised by the Archbishop of Canterbury on Monday afternoon in the Chapel Royal, St James's Palace in London.
His six godparents were announced as: Nicholas van Cutsem; Guy Pelly; Harry Aubrey-Fletcher; The Lady Laura Meade; Mrs Robert Carter; and Miss Lucy Middleton.
The christening will be a small affair for immediate family, the godparents and their spouses.
Prince George and Princess Charlotte will be there to see younger brother Louis's big day in the intimate surrounding of the oak panelled Chapel Royal.
Grandfather the Prince of Wales and his wife the Duchess of Cornwall will be present, along with Louis' maternal grandparents Carole and Michael Middleton.
The Duke and Duchess of Sussex will also be guests, as will Kate's brother James Middleton, and Kate's pregnant sister Pippa with husband James Matthews - the brother of former Made in Chelsea star Spencer Matthews.
The Queen has been spending time with the duke in Norfolk, and will be travelling back to London on Monday.