Just as one's DNA can reveal family traits, astrology does likewise.
An astrological peek reveals the new prince is a Cancer with Mercury, Mars and Jupiter in Cancer.
If this baby had been born 36 minutes later, he would be a Leo - the sign of royalty.
But he has plenty of royal company in Cancer.
The baby's father, Prince William, has Sun and Moon in Cancer; his mother Kate has her Moon in Cancer, and his grandmother Princess Diana was a Cancer.
Cancer