Reformed vs. Lutheran Baptism
Lutherans as well as Reformed view baptism as the sign or seal of the covenant of grace, but the Lutherans argue that infants do not belong to the covenant or partake of covenant-holiness (sanctitas foederalis) before baptism, whereas the Reformed argue the covenant before baptism
Richard Muller, Dictionary of Latin and Greek Theological Terms : Drawn Principally from Protestant Scholastic Theology (Grand Rapids, Mich.: Baker Book House, 1985), 56