This sacrament is called Baptism, after the central rite by which it is carried out: to baptize (Greek baptizein) means to "plunge" or "immerse"; the "plunge" into the water symbolizes the catechumen's burial into Christ's death, from which he rises up by resurrection with him, as "a new creature."
Archdiocese of San Francisco Infant Baptismal Guidelines
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Information from the Catechism of the Catholic Church
Contact your parish church for more information on preparation and celebrating the sacrament