But Jesus said, Suffer little children, and forbid them not, to come unto me: for of such is the kingdom of heaven. Matt. 19:14.
But how, they ask, are infants regenerated, when not possessing a knowledge of either good or evil? We answer, that the work of God, though beyond the reach of our capacity, is not therefore null. Moreover, infants who are to be saved (and that some are saved at this age is certain) must, without question, be previously regenerated by the Lord. For if they bring innate corruption with them from their mother’s womb, they must be purified before they can be admitted into the kingdom of God, into which shall not enter any thing that defiles (Rev. 21:27). If they are born sinners, as David and Paul affirm, they must either remain unaccepted and hated by God, or be justified. And why do we ask more, when the Judge himself publicly declares, that “except a man be born again, he cannot see the kingdom of God?” (John 3:3).
And, indeed, Christ was sanctified from earliest infancy, that he might sanctify his elect in himself at any age, without distinction. For as he, in order to wipe away the guilt of disobedience which had been committed in our flesh assumed that very flesh, that in it he might, on our account and in our stead, perform a perfect obedience, so he was conceived by the Holy Spirit, that, completely pervaded with his holiness in the flesh which he had assumed he might transfuse it into us. If in Christ we have a perfect pattern of all the grace, which God bestows on all his children, in this instance we have a proof that the age of infancy is not incapable of receiving sanctification. This, at least, we set down as incontrovertible, that none of the elect is called away from the present life without being previously sanctified and regenerated by the Spirit of God.