1. Romans 10 makes it clear that God chooses baptism of believers - confession of believers etc. The Acts 2 model for baptism is something that the RCC seems to have largely forgotten as it appeals now to magic sacriment and holy powers of priests to "mark the soul" of lost infants.
2. There is no text in all of scripture where any infant at all is ever baptized or sprinkled in order to save them. No not even one.
in Christ,
Bob
But it was widely practiced by the Church at the very earliest of times. Tertullian (not an advocate of infant baptism) confirms this in his writing.
Here are some sources:
Polycarp (69-155), a disciple of the Apostle John, was baptized as an infant. This enabled him to say at his martyrdom. "Eighty and six years have I served the Lord Christ" (Martyrdom of Polycarp 9: 3).
Irenaeus (130 - 200), some 35 years later in 185, writes in Against Heresies II 22: 4 that Jesus "came to save all through means of Himself - all. I say, who through him are born again to God - infants and children, boys and youth, and old men."
Justin Martyr states that Baptism is the circumcision of the New Testament.
Elsewhere Origen wrote in his Homily on Luke 14: "Infants are to be baptized for the remission of sins. Cyprian’s reply to a country bishop, Fidus, who wrote him regarding the Baptism of infants, is even more explicit. Should we wait until the eighth day as did the Jews in circumcision? No, the child should be baptized as soon as it is born (To Fidus 1: 2).'
I believe they practiced it from the beginning of the Church because they had been instructed to do so by the apostles teachings.
(Taken from Issues, Etc.) Regarding burials and cemeteries of as early as 200 AD
In the second last line is the phrase Dei Serv(u)s which means slave of God followed by the Chi Rho symbol for Christ. The last line is the Greek ichtheos familiar as the "fish symbol" - an anagram for Jesus Christ God’s Son Savior. These words and symbols mark the one-year, two months, and four-day-old child as a baptized Christian.
And again, in the NT whole household were baptized. If you do a little study on what constituted a household during these times it become rather silly to think that no infants would have been part of a household.