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.

China-North Korea bridge opens 12 years after completion
DR Congo Ebola death toll passes 4,400 in record-breaking outbreak
Saudi-led coalition intercepts drone over Eastern Region
Ukraine accuses SpaceX of crippling drone missions as ties with US worsen
Kenya reports second Ebola case, family member of first patient
