LONDON (AFP) - From fashion to specially-minted coins, here is an A to Z on Prince William and his wife Kate's second child, a baby daughter born on Saturday.
A is for ANNOUNCEMENT: A proclamation was displayed on an easel at the gates of Buckingham Palace, while news of the birth was tweeted by Kensington Palace and e-mailed to the press.
B is for BROTHER: The new royal baby is 21 months younger than older brother Prince George, who is directly in line to become king one day.
C is for CHRISTENING: The baby will be baptised wearing a replica of a lace and satin gown that has been used since 1841. Tradition dictates the Archbishop of Canterbury Justin Welby, England's highest cleric, will conduct the christening.
D is for DUTY: Once an adult, a lifetime of royal duty on behalf of the sovereign awaits.
E is for EDUCATION: The new royal is set to enjoy exclusive schooling. Both William and his brother Prince Harry went to the elite boarding school Eton for boys.
F is for FASHION: The new princess will be a trendsetter before she can walk and talk - anything George has been seen wearing has flown off the shelves.
G is for GRANDPARENTS: William's father Prince Charles, the heir to the throne, and his wife Camilla are expected to visit the baby in hospital, along with Kate's parents Michael and Carole Middleton.
H is for HOME: The princess will grow up at the Cambridges' apartment in London's Kensington Palace and Anmer Hall, a country house on Queen Elizabeth II's private Sandringham estate in eastern England.
I is for INTEREST: The birth has sparked huge interest around the world, with international media camped outside the hospital doors waiting for the first glimpse of the baby girl.
J is for JORDAN: The baby will be baptised with water from the River Jordan.
K is for KATE: The 33-year-old duchess suffered acute morning sickness again during her second pregnancy, causing her to miss royal engagements.
L is for LINE OF SUCCESSION: The princess was born fourth in line to inherit the throne, behind George and directly in front of uncle Harry.
M for MEMORABILIA: The Centre for Retail Research reckons the royal baby will bring retail sales of around £60 million to £70 million (S$120 million to S$140 million), far below the £247 million boost attributed to George.
N is for NAMES: Royal babies often get several Christian names, with George getting three. Bookmakers' favourites for a girl are Alice, Elizabeth, Charlotte, Alexandra and Victoria.
O is for OBSTETRICIANS: The medical team was led by Guy Thorpe-Beeston, the surgeon-gynaecologist to the royal household, who was assisted by his predecessor Alan Farthing.
P for PRIMOGENITURE: Laws which took effect in March ending male primogeniture mean girls born after Oct 28, 2011 can no longer be overtaken by younger brothers in the line of succession.
Q is for QUEEN ELIZABETH II: The baby is the monarch's fifth great-grandchild and her 17th descendant.
R is for ROYAL MINT: They will produce a £5 coin in celebration and gift a special "lucky" silver penny to 2,015 babies born on the same day.
S is for ST MARY'S HOSPITAL: The baby was born in the private Lindo Wing of the hospital in Paddington, central London. A two-room suite costs £6,750 a night, though consultants' fees can double that.
T is for TITLE: The baby will be known as Her Royal Highness Princess (name) of Cambridge.
U is for UNCLE HARRY: William's fun-loving brother is coming out of the army and so may have more time to babysit. The baby will also have Auntie Pippa and Uncle James on her mother's side.
V is for VICTORIA: The baby will be the great-great-great-great-great-grandchild of 19th-century queen Victoria.
W is for WILLIAM: The 32-year-old duke is training to become an air ambulance pilot. He will take two weeks' paternity leave.
X is for the baby girl's name, which is not yet known.
Y is for YELLOW: Bookmakers are taking bets on the colour of Kate's dress when she leaves hospital, with a spring-like yellow among the favourites for the first baby pictures that will zip round the world.
Z is for ZZZ..: William and Kate can expect months of sleepless nights, but their nanny will be on hand to ease the burden.