St. Zosimus

Likewise it has been decided that whoever says that infants fresh from their mothers' wombs ought not to be baptized, or says that they are indeed baptized unto the remission of sins, but that they draw nothing of the original sin from Adam, which is expiated in the bath of regeneration, whence it follows that in regard to them the form of baptism "unto the remission of sins" is understood as not true, but as false, let him be anathema.

Since what the Apostle says: "Through one man sin entered into the world (and through sin death), and so passed into all men, in whom all have sinned" [cf. Rom. 5:12], must not to be understood otherwise than as the Catholic Church spread everywhere has always understood it. For on account of this rule of faith even infants, who in themselves thus far have not been able to commit any sin, are therefore truly baptized unto the remission of sins, so that that which they have contracted from generation may be cleansed in them by regeneration.

St. Zosimus
Council of Mileum
A.D. 416