Even though the words baptism and christening are used interchangeably, there is a subtle difference. Christening refers to the naming ceremony (to “christen” means to “give a name to”) where as baptism is one of seven sacraments in the Catholic Church.
In the sacrament of Baptism the baby’s name is used and mentioned, however it is the rite of claiming the child for Christ and his Church that is celebrated.
Baptism represents a deliberate act of identification with the person of Jesus Christ and his Church. This decision implies a personal relationship with Jesus that requires nurturing through such things as worship, prayer, Bible study and other spiritual disciplines.
Some churches will use the word ‘baptism’ and some the word ‘christening’. Babies are Baptized during a christening service just as couples are ‘married’ during a ‘wedding’ service.