Baptism is a Christian concept.
Jesus.
The Baptism of the Lord is celebrated on the feast: the Solemnity of the Epiphany, usually celebrated in the Roman church on 6th of January.
Baptism, Holy Communion and Reconciliation, Confirmation
Confirmation is the second half of baptism, it completes one's initiation into Christianity. It can be celebrated anytime after Baptism, in most of the Rites, it is celebrated immediately with baptism, in the Latin Rite, it has be separated and is usually given after the age of 12, the exact age is up to the local Bishop.
Usually by sprinkling water on the head or by immersion in water.
Baptism, Conformation, and death
In a Catholic church baptism is celebrated with the child the parent and the Godparents. The priest pours water to cleanse the sins of the baby and then puts oil on the babies forehead to represent the new life of the baby. it is then follwed by a aprty for the baptism.
Assuming that you are referring to the Seven Sacraments: Baptism, Confirmation, Eucharist, Penance, Matrimony, Holy Orders, and Anointing.
In the first years of the Church Baptism, Confirmation and Eucharist were all celebrated in the same ceremony; this is how it is still done in Eastern Orthodoxy, Oriental Orthodoxy and Eastern Catholicism. As the Church grew, and presbyters rather than bishops were local leaders, the Church in the West began to separate Confirmation from Baptism. Confirmation was celebrated in each parish by the bishop as a sign of unity.
The Baptism Pool holds the water that will be used for the Baptism.
The Baptism of Jesus is celebrated during the liturgical season of Epiphany in the Christian calendar. This season highlights the revelation of Christ to the world, including his baptism by John the Baptist. The feast is typically observed on the Sunday following the Feast of the Epiphany, which falls on January 6. It marks a significant moment in Jesus' ministry, symbolizing the beginning of his public life and mission.