In May 1948, a few months into her pregnancy with Prince Charles, the future Queen's nausea was kept behind closed doors. Nevertheless, she and the Duke of Edinburgh kept up an active social life, going to the races, restaurants, nightclubs and dances.
News of the pregnancy was kept low key, with the Princess merely reported to be "in an interesting condition" and that she would "undertake no public engagements after the end of June".
When baby Charles finally arrived on 14 November night in 1948, so enthusiastic was the singing and cheering of the crowd outside Buckingham Palace that they had to be asked to leave.
Around midnight, three hours after Prince Charles's birth, two Royal Household officials walked into the forecourt to ask the well-wishers to disperse, telling them: "Princess Elizabeth wants to have some rest." She had woken from her anaesthetic surrounded by pink carnations, a gift from her husband, who was not present at the birth – he opted for a game of squash, and a swim in the Palace pool.
Similarly to the birth of William and Kate's baby, the fountains in Trafalgar Square were lit blue for a boy and bells rang out across the country.
Elizabeth, who was just 22, was clearly besotted with her baby. "Don’t you think he is quite adorable?" she wrote to a friend. "I still can’t believe he is really mine."
A month later, the second in line to the throne was baptised Charles Philip Arthur George in the music room of Buckingham Palace by the Archbishop of Canterbury.