Prince George was born on July 22
The Duke and Duchess of Cambridge have announced details of their son's christening.
Prince George will be christened on Wednesday 23 October at the Chapel Royal at St James's Palace.
The Archbishop of Canterbury, the Most Reverend Justin Welby, will perform the christening.
The prince, who was born on 22 July at St Mary's Hospital in London, is third in line to the throne held by his great-grandmother.
The BBC's Ben Geoghegan said "close members of the families" would attend the christening, along with "some other senior guests".
He said the Royal Chapel, built by Henry VIII, was small and the duke and duchess were believed to want a "small, private ceremony".
Earlier, Kensington Palace announced that a new coat of arms had been chosen to represent the duke and duchess as a married couple.
The conjugal coat of arms, approved by the Queen earlier this year, features separate shields to represent the royal husband and wife.
Prince William was christened at Buckingham Palace in August 1982 by Dr Robert Runcie, then the Archbishop of Canterbury.