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:
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.
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.
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.
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."
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.