The son of Prince Harry and Meghan Markle is expected to be baptised later on Saturday.
The Archbishop of Canterbury will conduct the rite during a private ceremony.
Close family and friends will attend the christening, which will take place inside a private chapel at Windsor Castle.
However the Queen will not be there.
Archie Harrison Mountbatten-Windsor was born on May 6 this year.

One child injured in Iranian attacks on Qatar
US completes 'major' wave of strikes on Iran, Gulf states under attack
Fire at orphanage in Algiers kills 11
Former Italian motorway boss sentenced over Genoa bridge tragedy
