Quoting from http://religion.adherents.com/Christianity/20-christening.html
"There is a lot of confusion in regards to baptism and christening. Often, the words are used separately. It is often believed they are two different things, and at one time, they were. Now, though, it is important to understand that they are fundamentally the same. That is due to changes that have been made. Now, both words can be used interchangeably and mean the same thing.
"When christening first began, it was a ceremony in which a child was given a Christian name and then baptized. The christening referred to the naming ceremony. However, because of the baptism, many people thought the child was being christened when he was baptized. Therefore, baptism was rarely a word associated with infants.
"Now, children are named prior to the baptism. Since they are no longer given Christian names while being baptized, there is no need for a traditional christening. Therefore, children and adults now just get baptized. However, it is still often referred to as a christening. It is important to realize, though, that a christening and a baptism are the same thing."
