No. 1278 and 1279, page 325 of the Catechism of the Catholic Church: The Celebration of the Christian Mystery; Libreria Editrice Vaticana: Urbi Et Orbi Communications:
[1278]
The essential rite of Baptism consists in immersing the candidate in water or pouring water on his head, while pronouncing the invocation of the Most Holy Trinity: the Father, the Son, and the Holy Spirit.
[1279]
The fruit of Baptism, or baptismal grace, is a rich reality that includes forgiveness of original sin and all personal sins, birth into the new life by which man becomes an adoptive son of the Father, a member of Christ and a temple of the Holy Spirit. By this very fact the person baptized is incorporated into the Church, the Body of Christ, and made a sharer in the priesthood of Christ.
[633]
Q. Who can administer Baptism?
A. A priest is the ordinary minister of baptism; but in case of necessity anyone who has the use of reason may baptize.
[638]
Q. How is Baptism given?
A. Whoever baptizes should pour water on the head of the person to be baptized, and say, while pouring the water: "I baptize thee in the name of the Father, and of the Son, and of the Holy Ghost."
[647]
Q. What are the chief ceremonies used in solemn baptism, and what do they signify?
A. The chief ceremonies used in solemn baptism are: (1) A profession of faith and renouncement of the devil to signify our worthiness; (2) The placing of salt in the mouth to signify the wisdom imparted by faith; (3) The holding of the priest's stole to signify our reception into the Church; (4) The anointing to signify the strength given by the Sacrament; (5) The giving of the white garment or cloth to signify our sinless state after baptism; and (6) The giving of the lighted candle to signify the light of faith and fire of love that should dwell in our souls.