"In respect to the case of infants, which you say ought not to be baptized within the second or third day after birth, and that the law of ancient circumcision should be regarded, so that you think that one who is just born should not be baptized and sanctified within the eighth day, we all thought very differently in our council...we ought to shrink from hindering an infant, who being lately born, has not sinned, except in that, being born after the flesh according to Adam, he has contracted the contagion of the ancient death at its earliest birth, who approaches the more easily on this very account to the reception of the forgiveness of sins-that to him are remitted, not his own sins, but the sins of another (Adam)."-Cyprian of Carthage, martyred 258
I would say show me in scripture where baptism is a source of regeneration