These things are therefore in essence what Church documents about baptism deal with. Baptism is a true sacrament instituted by Christ. It is administered by washing with natural water and at the same time invoking the Most Holy Trinity. Anybody, even an unbeliever or a heretic can validly administer baptism. Since it confers grace by the signs' being properly carried out children can and should be baptized even while still infants.
Baptism is necessary for salvation.
The baptism of young children is not profitless. The Eucharistic meal can only be prepared in the sacrifice of the Mass. Thus the mystery of the Eucharist summarizes the whole mystery of our redemption. There are two fundamental relationships in which Christ stands to us. First, he is our priestly mediator with God, and offers him atonement for our sins.