The Enchiridion 43
43 Baptism and the Grace Which It Typifies are Open to All, Both Infants and Adults PL 40, 253
For from the infant newly born to the old man bent with age, as there is none shut out from baptism, so there is none who in baptism does not die to sin. But infants die only to original sin; those who are older die also to all the sins which their evil lives have added to the sin which they brought with them.
In Baptismo omnes peccato mori, et parvulos, et majores. A parvulo enim recens nato usque ad decrepitum senem, sicut nullus est prohibendus a Baptismo, ita nullus est qui non peccato moriatur in Baptismo: sed parvuli tantum originali, majores autem etiam iis omnibus moriuntur peccatis, quaecumque male vivendo addiderunt ad illud quod nascendo traxerunt.