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.

Israeli strikes kill 15 in Gaza, minister says no deal to halt attacks
Death toll from migrant rush into Ceuta rises to 72
Ukrainian drones kill eight in Russia
Two helicopters collide as Greece battles wildfires
