I have also seen Cornelius’ household used for an example of baptism. (Acts 10) This doesn’t state that the whole household was baptized. It said that the Holy Spirit fell on all who heard the message as evidenced by the family speaking in tongues. It doesn’t say if they baptized any infants who were unable to display signs of receiving the Holy Spirit.
Yes, but it would be contrary to the normal line of thinking for any family to enter into a new way of life without including their children. Since the Apostles understood baptism to be a circumcusion of the heart done by the Holy Spirit, it would not have made sense to withold if from children.
One of the earliest writings, the Didache, required that the one being baptized, along with the baptizer, fast for 1-2 days. It doesn’t make exceptions for the infants of the household. There is other evidence that infants were not baptized at first. Over the early centuries it began to become common and accepted.
Yes, children and the elderly were always exempted from fasting, but I think that infant baptism was the norm from the beginning because the faith came into the world through the Jews, and it was normative for them to bring their children to God in ritual.
Origen wrote that “according to the usage of the Church, baptism is given even to infants” (Holilies on Leviticus, 8:3:11 [A.D. 244]). The Council of Carthage, in 253, condemned the opinion that baptism should be withheld from infants until the eighth day after birth. Later, Augustine taught, “The custom of Mother Church in baptizing infants is certainly not to be scorned . . . nor is it to be believed that its tradition is anything except apostolic” (Literal Interpretation of Genesis 10:23:39 [A.D. 408]). These writings are supported by the Sacred Traditions, preserved in the prayers and liturgy of the Church, which show that infant baptisms have always been the practice.
Consider, too, that Fathers raised in Christian homes. (such as Irenaeus) would hardly have upheld infant baptism as apostolic if their own baptism had been deferred until the age of reason.
For example, infant baptism is assumed in Irenaeus’ writings when he affirms that regeneration happens in baptism, and that Jesus came so even infants could be regenerated. Since he was born in a Christian home in Smyrna around the year 140, this means he was probably baptized around 140. He was also probably baptized by the bishop of Smyrna who at that time was Polycarp, a personal disciple of the apostle John, who had died only a few decades before.
Irenaeus
“And [Naaman] dipped himself . . . seven times in the Jordan” [2 Kgs. 5:14]. It was not for nothing that Naaman of old, when suffering from leprosy, was purified upon his being baptized, but [this served] as an indication to us. For as we are lepers in sin, we are made clean, by means of the sacred water and the invocation of the Lord, from our old transgressions, being spiritually regenerated as newborn babes, even as the Lord has declared: “Except a man be born again through water and the Spirit, he shall not enter into the kingdom of heaven” [John 3:5]… (Fragment 34 [A.D. 190])
He [Jesus] came to save all through himself; all, I say, who through him are reborn in God: infants, and children, and youths, and old men. Therefore he passed through every age, becoming an infant for infants, sanctifying infants; a child for children, sanctifying those who are of that age . . . [so that] he might be the perfect teacher in all things, perfect not only in respect to the setting forth of truth, perfect also in respect to relative age. (Against Heresies 2:22:4 [A.D. 189])
The reference to Naaman dipping in the Jordan brings to mind the ritual washings you mentioned.
Most scholars would say that the story of Naaman was a foreshadowing that the “waters of life” that were later known as baptism would originate in the nation of Israel (“salvation is of the Jews”) where it was customary to bring children into the faith.