Are you not in error because you do not know the scriptures or the power of God?
INFANT BAPTISM PROVED FROM SCRIPTURE
9 Then God said to Abraham, “As for you, you must keep my covenant, you and your descendants after you for the generations to come. 10 This is my covenant with you and your descendants after you, the covenant you are to keep: Every male among you shall be circumcised. 11 You are to undergo circumcision, and it will be the sign of the covenant between me and you. 12 For the generations to come every male among you who is eight days old must be circumcised, including those born in your household or bought with money from a foreigner—those who are not your offspring. 13 Whether born in your household or bought with your money, they must be circumcised. My covenant in your flesh is to be an everlasting covenant. 14 Any uncircumcised male, who has not been circumcised in the flesh, will be cut off from his people; he has broken my covenant.”
3 On the eighth day the boy is to be circumcised.
These texts show the circumcision of eight-day-old babies as the way of entering into the Old Covenant.
Connection to New Covenant
In him also you were circumcised with a circumcision made without hands, by putting off the body of flesh in the circumcision of Christ; 12and you were buried with him in baptism, in which you were also raised with him through faith in the working of God, who raised him from the dead.
Baptism is the new “circumcision of Christ” for all people of the New Covenant.
Do Infants Need Baptism?
1 "Man born of woman is of few days and full of trouble. 2 He springs up like a flower and withers away; like a fleeting shadow, he does not endure. 3 Do you fix your eye on such a one? Will you bring him before you for judgment? 4 Who can bring what is pure from the impure? No one!
5 Surely I was sinful at birth, sinful from the time my mother conceived me.
We are conceived in the iniquity of sin. This shows the need for baptism from the moment of conception.
Jesus Extols Child-like Faith
2 He called a little child and had him stand among them. 3And he said: "I tell you the truth, unless you change and become like little children, you will never enter the kingdom of heaven. 4Therefore, whoever humbles himself like this child is the greatest in the kingdom of heaven.
Jesus says unless we become like children, we cannot enter into heaven. So why would children be excluded from baptism?
Jesus Receives Little Children and Infants
13Then little children were brought to Jesus for him to place his hands on them and pray for them. But the disciples rebuked those who brought them. 14 Jesus said, “Let the little children come to me, and do not hinder them, for the kingdom of heaven belongs to such as these.” 15 When he had placed his hands on them, he went on from there.
13People were bringing little children to Jesus to have him touch them, but the disciples rebuked them. 14When Jesus saw this, he was indignant. He said to them, “Let the little children come to me, and do not hinder them, for the kingdom of God belongs to such as these. 15I tell you the truth, anyone who will not receive the kingdom of God like a little child will never enter it.” 16And he took the children in his arms, put his hands on them and blessed them.
Jesus says to let the children come to Him for the kingdom of God also belongs to them. There is no age limit on entering the kingdom, and no age limit for being eligible for baptism.
15People were also bringing babies to Jesus to have him touch them. When the disciples saw this, they rebuked them. 16But Jesus called the children to him and said, “Let the little children come to me, and do not hinder them, for the kingdom of God belongs to such as these. 17I tell you the truth, anyone who will not receive the kingdom of God like a little child will never enter it.”
The Church Begins to Preach Baptism
38 Peter replied, “Repent and be baptized, every one of you, in the name of Jesus Christ for the forgiveness of your sins. And you will receive the gift of the Holy Spirit. 39 The promise is for you and your children and for all who are far off—for all whom the Lord our God will call.”
Peter did not say, “Every one of you adults”; he said, “Every one of you” without qualification and added “the promise (of the Holy Spirit) is for you and your children”. Baptism and the Holy Spirit are frequently connected throughout the Bible (cf. Ez. 36:25-27, Mt. 3:16, Jn. 3:5).
Then Peter said, 47"Can anyone keep these people from being baptized with water? They have received the Holy Spirit just as we have." 48So he ordered that they be baptized in the name of Jesus Christ. Then they asked Peter to stay with them for a few days.
Peter baptized the entire house of Cornelius which probably included infants and young children. There is not one word in this passage (or any other in scripture) about baptism being limited to adults.
13On the Sabbath we went outside the city gate to the river, where we expected to find a place of prayer. We sat down and began to speak to the women who had gathered there. 14One of those listening was a woman named Lydia, a dealer in purple cloth from the city of Thyatira, who was a worshiper of God. The Lord opened her heart to respond to Paul’s message. 15When she and the members of her household were baptized, she invited us to her home.
Paul baptized Lydia and her entire household. The word “household” comes from the Greek word “oikos” which is a household that includes infants and children. Further, Paul baptizes the household based on Lydia’s faith, not the faith of the members of the household. This demonstrates that parents can present their children for baptism based on the parents’ faith, not the children’s faith.
From the Catechism of the Catholic Church:
The Baptism of infants
1250 Born with a fallen human nature and tainted by original sin, children also have need of the new birth in Baptism to be freed from the power of darkness and brought into the realm of the freedom of the children of God, to which all men are called.50 The sheer gratuitousness of the grace of salvation is particularly manifest in infant Baptism. The Church and the parents would deny a child the priceless grace of becoming a child of God were they not to confer Baptism shortly after birth.51
1251 Christian parents will recognize that this practice also accords with their role as nurturers of the life that God has entrusted to them.52
1252 The practice of infant Baptism is an immemorial tradition of the Church. There is explicit testimony to this practice from the second century on, and it is quite possible that, from the beginning of the apostolic preaching, when whole “households” received baptism, infants may also have been baptized.53