Black-and-white photograph taken at Kensington Palace of a group of eight people. From left to right: Princess Alexandra (holding James Ogilvy); Queen Elizabeth II (holding Prince Edward); Princess Margaret (holding Lady Sarah); and The Duchess of Kent (holding Lady Helen Windsor).

Four royal babies were born within two months of each other in 1964 and delivered by the same obstetrician, Sir John Peel. It was Princess Margaret’s idea to ask her husband to photograph the four mothers with their babies to create a portrait to be signed by them and presented to Peel.