When a royal baby is born, there are usually a few traditions that the firm follow.
The Queen is usually the first person to be notified about the newborn's arrival, followed by other members of the immediate family.
A notice is then placed on an easel outside the front of Buckingham Palace, which notes the sex, weight and date of birth and is signed by the medical team who delivered the baby.
Princess Diana and the Duchess of Cambridge both attended a media photocall a few hours after giving birth to each of their children outside the Lindo Wing at St Mary's hospital in Paddington.
Not all royal babies make their public debut that soon after birth, but Diana and Kate were both carrying direct heirs to the throne.
The Duke and Duchess of Sussex have announced they're keeping details of their baby's birth private and will spend a few days with their newborn before letting the world know about his or her arrival. This is not too dissimilar to what Princess Anne's daughter Zara and husband Mike Tindall did after the birth of their daughters Mia and Lena.
It used to be customary for public officials to be present at royal births, such as the Home Secretary, but this practice was stopped before the birth of Prince Charles in 1948.
It was also quite common for fathers not to be present at the birth of their children. It's believed that Prince Philip was playing squash when eldest son Charles was born.
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