Here is a look at the royal baby in numbers:
2 – Baby Sussex already has two family pets ready and waiting – Meghan’s beagle Guy, and a black labrador.
3 – Baby’s royal first cousins – Prince George, Princess Charlotte and Prince Louis.
4 – The baby boy or girl will be the Prince of Wales’s fourth grandchild.
4 – Patronages Meghan has taken on during her pregnancy.
6 – Harry’s place in line to the throne.
7 – The baby will be born seventh in line to the throne.
7 – Meghan starred in seven seasons of the US legal drama Suits as paralegal-turned-lawyer Rachel Zane before marrying Harry.
8 – The Queen’s great-grandchildren after the baby is born. Newest additions include Prince Louis and Lena Tindall.
8 – The Duke of York’s position in line to the throne after the baby’s arrival. Andrew was born second in line in 1960.
34 – Harry’s age.
37 – Meghan’s age.
41 – Royal births are celebrated with a 41-gun salute.
£7,500 – Cost of a one-night stay and delivery package at the private Lindo Wing, where Prince George and his siblings were born, including a suite of two rooms, but excluding consultants’ fees.
£330,000 – Estimated total cost of Meghan’s lavish New York baby shower, including travel on a private jet said to have been paid for by the duchess’s friends.
£3 million – Estimated cost to the taxpayer of renovations at Harry and Meghan’s new home Frogmore Cottage on the Windsor Estate.
£47.4 million – The amount the Queen received from the taxpayer via the Sovereign Grant in 2017/18 – 69p for each person in the country.