The Sacrament of Baptism incorporates us into the Church, the Body of Christ, and is our introduction to the life of the Holy Trinity. Water is a natural symbol of cleansing and newness of life. Through the three-fold immersion in the waters of Baptism in the Name of the Holy Trinity, one dies to the old ways of sin and is born to a new life in Christ. Baptism is one's public identification with Christ Death and victorious Resurrection. Following the custom of the early Church, Orthodoxy encourages the baptism of infants. The Church believes that the Sacrament is bearing witness to the action of God who chooses a child to be an important member of His people. From the day of their baptism, children are expected to mature in the life of the Spirit, through their family and the Church. The Baptism of adults is practiced when there was no previous baptism in the name of the Holy Trinity.
Source: http://www.goarch.org/en/ourfaith/articles/article7105.asp

For more information on being baptized in the Greek Orthodox Church, please contact us.

Article: Infant Baptism