It is sometimes charged that Calvin taught the actual damnation of some of those who die in infancy. A careful examination of his writings, however, does not bear out that charge. He explicitly taught that some of the elect die in infancy and that they are saved as infants. He also taught that there were reprobate infants; for he held that reprobation as well as election was eternal, and that the non-elect come into this life reprobate. But nowhere did he teach that the reprobate die and are lost as infants. He of course rejected the Pelagian view which denied original sin and grounded the salvation of those who die in infancy on their supposed innocence and sinlessness. Calvin’s views in this respect have been quite thoroughly investigated by Dr. R. A. Webb and his findings are summarized in the following paragraph: “Calvin teaches that all the reprobate ‘procure’ — (that is his own word) — ‘procure’ their own destruction; and they procure their destruction by their own personal and conscious acts of ‘impiety,’ ‘wickedness,’ and ‘rebellion.’ Now reprobate infants, though guilty of original sin and under condemnation, cannot, while they are infants, thus ‘procure’ their own destruction by their personal acts of impiety, wickedness, and rebellion. They must, therefore, live to the years of moral responsibility in order to perpetrate the acts of impiety, wickedness and rebellion, which Calvin defines as the mode through which they procure their destruction. While, therefore, Calvin teaches that there are reprobate infants, and that these will be finally lost, he nowhere teaches that they will be lost as infants, and while they are infants; but, on the contrary, he declares that all the reprobate ‘procure’ their own destruction by personal acts of impiety, wickedness and rebellion. Consequently, his own reasoning compels him to hold (to be consistent with himself), that no reprobate child can die in infancy; but all such must live to the age of moral accountability, and translate original sin into actual sin.” 37
37. Calvin Memorial Addresses, p. 112.
To Summarize; what Calvin is saying is; all infants who die as infants are going to be saved because they are the elect of God. There are no non-elect infants that die as infants. Those children who group up to practice sin become guilty for actually sinning. The non-elect show their sinful nature as we all do, but never come to the knowledge of repentance and the truth.