Baptism is a sacrament ordained by the Lord Jesus Christ. It is a sign and seal of the inclusion of the person who is baptized in the covenant of grace. Teaching that we and our children are conceived and born in sin, it witnesses and seals unto us the remission of sins and the bestowal of all the gifts of salvation through union with Christ. Baptism with water signifies and seals cleansing from sin by the blood and the Spirit of Christ, together with our death unto sin and our resurrection unto newness of life by virtue of the death and resurrection of Christ. Since these gifts of salvation are the gracious provision of the triune God, who is pleased to claim us as his very own, we are baptized into the name of the Father and of the Son and of the Holy Ghost. And since baptized persons are called upon to assume the obligations of the covenant, baptism summons us to renounce the devil, the world and the flesh and to walk humbly with our God in devotion to his commandments.
Why infants should be baptized
Although our young children do not yet understand these things, they are nevertheless to be baptized. For the promise of the covenant is made to believers and to their seed, as God declared unto Abraham: "And I will establish my covenant between me and thee and thy seed after thee throughout their generations for an everlasting covenant, to be a God unto thee and to thy seed after thee." In the new dispensation no less than in the old, the seed of the faithful, born within the church, have, by virtue of their birth, interest in the covenant and right to the seal of it and to the outward privileges of the church. For the covenant of grace is the same in substance under both dispensations, and the grace of God for the consolation of believers is even more fully manifested in the new dispensation. Moreover, our Saviour admitted little children into his presence, embracing and blessing them, and saying, "Of such is the kingdom of God." So the children of the covenant are by baptism distinguished from the world and solemnly received into the visible church.