On Infant Baptism

Council of Carthage ca. 419

Likewise it seemed good that whosoever denies that infants newly from their mother’s wombs should be baptized, or says that baptism is for remission of sins, but that they derive from Adam no original sin, which needs to be removed by the laver of regeneration, from whence the conclusion follows, that in them the form of baptism for the remission of sins, is to be understood as false and not true, let him be anathema.

For no otherwise can be understood what the Apostle says, By one man sin has come into the world, and death through sin, and so death passed upon all men in that all have sinned, than the Catholic Church everywhere diffused has always understood it. For on account of this rule of faith (regulam fidei) even infants, who could have committed as yet no sin themselves, therefore are truly baptized for the remission of sins, in order that what in them is the result of generation may be cleansed by regeneration. (Canon 110)