Welcome to CC, Azawah...
If by "Christening" you mean the ritual around naming infants of believers, it is not in the Bible. It is somewhat akin to infant baptism, on which there are varied opinions. I don't hold to infant baptism as I don't see it in the Bible; others disagree.
The church I attend practices dedication, where parents make a commitment before the Lord to raise the child to love and serve the Lord. Though optional, most parents choose to do it if they are significantly involved in the church. It also serves to remind the congregation that we may be involved in that child's development at any stage.