Royal sources have divulged plenty of information about where and when Kate will give birth but here are nine more surprising facts.
The Duchess of Cambridge will have her baby at the same London hospital where her husband was born 30 years ago.
Kate Middleton has made her final public appearance before the birth of her first child when she attended the Trooping the Colour parade.
The Duchess of Cambridge will have her baby at the same wing of the London hospital where her husband was born 30 years ago, royal officials have revealed.
Prince William will be at the birth at St Mary's hospital in Paddington. The couple have decided not to find out is sex in advance.
ITV News Correspondent Nina Nannar reports.
The Duke and Duchess of Cambridge have chosen not to know the gender of their first child before it is born, royal sources said.
William will be present at the birth of the baby, which is to be delivered at the Lindo Wing of St. Mary's Hospital in London.
The first public announcement that the birth is imminent will be made once Kate is in hospital and in the early stages of labour.
When the baby is born, Kate's parents and the Queen will be told before a statement is issued.
A formal declaration will then be driven to Buckingham Palace and placed on an easel. The same happened after Prince William's birth.
The public will be told the baby's gender, weight, and time of birth but it may be some time before William and Kate decide on a name.
Prince William intends to be present at the birth of his first child, which is due in mid-July.
His father, Prince Charles, was present at his birth in 1982, and, according to The Times, remarked: “It is rather a grown up thing I found, rather a shock to the system”.
The Duchess of Cambridge will give birth in the same hospital wing in which Prince William was born in 1982, ITV News understands.
The Princess of Wales gave birth to both her sons in the Lindo Wing of St. Mary's Hospital in Paddington, central London, and it is understood William's child will be born there too.
After the Trooping the Colour the King's Troop Royal Horse Artillery fired a 41-gun salute in Green Park to mark the Queen's official birthday.
The royals then gathered on the balcony at Buckingham Palace to watch the traditional RAF flypast.
Thousands of spectators crowded around the front of the palace and on The Mall, many cheering as a succession of planes roared overhead.