The First Christians baptized infants because the first Christians have always done so. This practice was never challenged until the Middle Ages.
“Let the children come to me, and do not hinder them; for to such belongs the kingdom of God” (Luke 18:16). Some say that only an adult can make a conscious decision to be baptized. So what happens to the children who die before they have a chance to make this decision? We must remember that Salvation is a gift from God, and all are capable of receiving this gift,
For the promise is for you and your children (Acts 2:38,39)
The remission of sins for an adult is a treasure included in Baptism, but sinning is not a requirement for Baptism, it is a fact of our fallen nature. From the writings of the first Christians and from Scripture we find that the first Christians were baptized as adults to receive the gift of the Holy Spirit, because the church was just being formed. These adults who were first baptized began to baptize their own children at a very early age to bring them the same free gift of Salvation, the Holy Spirit that they had received as adults. "Believe in the Lord Jesus, and you shall be saved, you and your household . . . and immediately he was baptized, he and all his household. (Acts 16:15a) "
It was the obligation of these parents to raise their children in the Christian faith, teaching them the many treasures that Christ had gifted them. You will be hard pressed to find in the early church writings an early Christian who had not been baptized as a child. There are no writings of early Christians who were born into Christian families who at an age of reason made the decision to be baptized into Christ, to be born again, because they already were being raised in the faith. It was and is only those who did not know of Christ, who found Christ at a later age, who were called to the water and made the choice to renounce their accumulated sin, to enter into the community of Christians through the Great Sacrament of Baptism, to join in the Sacrament of Confession, forgiveness and reconciliation, for the lifelong battle over sin while being embraced by Christ.
Baptism is not just a testimony in the soul of an adult who has come to believe in the saving power of Christ, but is the means by which we clothe ourselves in the death and resurrection of Jesus Christ. For an infant, it is the receiving of the Holiest of Spirits, a blanket of security covered with the communion of saints in the One Body of Christ (Romans 6:4) (Galatians 3:27)
Peter said, “Repent, and be baptized, every one of you, in the name of Jesus Christ for the forgiveness of your sins; and you shall receive the gift of the Holy Spirit” (Acts 2:38) “For the promise is to you and to your children and to all that are far off, every one whom the Lord our God calls to him”
After these first Christians were baptized, they naturally passed this saving Grace on to their first-born, second-born and so on. This baptism of infants was not for conscious sin, the remission of sins committed since their birth, because they had not yet consciously sinned. But it was for the receiving of the Holy Spirit for the remission of original sin, that which we are all born with and by which we are afflicted, the why and reason for needing our Savior. As you ponder Scripture about Baptism, try to find where baptism is restricted only to adults. Where do we find the so-called “Age of Reason as a degree for receiving Baptism in the Scriptures "? Either the gift of salvation is freely given to those who hear the Shepherd’s voice and follow, or it is not. Is this gift earned through our sin? Or is this gift given, because of original sin, to all who accept this gift? And what about those who are mentally ill who cannot make decisions on their own, is not the receiving of the Spirit put forth to transform them, as well? Do we have to be smart enough to receive the gift of the Holy Spirit at Baptism? What father or mother does not give the gift of life to his or her child before an age of reason? What conditions can we as mere creatures place on the special gift of life, the special gift of baptism? A life in Christ.
“Now they were bringing even infants to him that he might touch them; and when the disciples saw it, they rebuked them. But Jesus called them to him, saying, ‘Let the children come to me, and do not hinder them; for to such belongs the kingdom of God’” (Luke 18:15–16).
God Bless
Rich
catholic-rcia.com