The Sacrament of Baptism is often called "the door of the Church", because it is the first of the seven sacraments, not only in time (since most Catholics receive it as infants) but in priority, since the reception of the other sacraments depends on it.
It is the first of the three Sacraments of Initiation, the other two being the Sacrament of Confirmation and the Sacrament of Holy Eucharist.
Once baptized, a person becomes a member of the Church. Traditionally, the rite of baptism was held outside the doors of the main part of the church, to signify this fact.
Baptism is the very mark of a Christian because it brings us into new life in Christ.
Baptism for Infants is for infants and children up to 6 years of age. If your child is 7 years or older, please see the next section.