Ten facts about Royal births

1. A team of 23 medical staff was on hand for the birth of Prince George and Princess Charlotte at the private Lindo Wing.

A handful of midwives and others led by a consultant obstetrician were in the delivery room, but obstetricians, gynaecologists, surgeons, haematologists and theatre staff were also waiting in the wings in case of an emergency.

2. After William was born in 1982, the Prince of Wales wrote how he was "so thankful I was beside Diana's bedside the whole time".

"I really felt as though I'd shared deeply in the process of birth," he added.

3. Diana was induced because she could not bear the pressure from the media any longer - and claimed doctors had to find a date that suited Charles and his polo fixtures.

4. The Queen, then Princess Elizabeth, was given an anaesthetic to help with the pain while in labour with first child Charles in 1948.

5. A restless Duke of Edinburgh occupied himself by playing squash while awaiting the arrival of his firstborn.

6. The Queen had all her four children - Charles, Anne, Andrew and Edward - at home at Buckingham Palace and Clarence House.

7. Princess Elizabeth was born at home by Caesarean section in her grandparents' house in Mayfair, London.