III. How is the Sacrament of Baptism Celebrated?

From The Catechism of the Catholic Church

1239
The essential rite of the sacrament follows: Baptism properly speaking. It
signifies and actually brings about death to sin and entry into the life of the
Most Holy Trinity through configuration to the Paschal mystery of Christ.
Baptism is performed in the most expressive way by triple immersion in the
baptismal water. However, from ancient times it has also been able to be
conferred by pouring the water three times over the candidate’s head.

PART TWO: THE CELEBRATION OF THE CHRISTIAN MYSTERY

SECTION TWO THE SEVEN SACRAMENTS OF THE CHURCH
- CHAPTER ONE THE SACRAMENTS OF CHRISTIAN INITIATION
  - Article 1 THE SACRAMENT OF BAPTISM
    - III. How is the Sacrament of Baptism Celebrated?

From The Catechism of the Catholic Church – rosary.team