Can you baptize a baby?
The New Testament never authorizes baptizing someone who cannot yet hear, believe, repent, confess, and appeal — capacities a pre-cognitive infant does not have. The text names no minimum age; it names a minimum capacity.
The New Testament does not authorize baptizing a baby — not because of any rule about age, but because every baptism in the canon has a prerequisite the text names before the water: hearing, believing, repenting, confessing, or being discipled. An infant cannot yet do any of those things.
What the text actually requires
Peter's instruction at Pentecost sets the pattern:
"Repent, and let each one of you be baptized in the name of Jesus Christ for the forgiveness of your sins, and you will receive the gift of the Holy Spirit." — Acts 2:38
The Greek word for "repent" (metanoeō, G3340) is an aorist imperative — a sharp command directed to a moral agent. The phrase "each one of you" (hekastos humōn, G1538) makes the command individual. The baptism that follows is a response to a personal, conscious turning.
Across every major baptism narrative in the New Testament — eleven passages in Acts and the Gospels — the same direction holds: hear, believe, repent, confess, then be baptized. Not once does baptism go first.
What about the infant vocabulary?
The Greek New Testament has three words for a pre-discerning child: paidion (G3813, "little child"), brephos (G1025, which covers the unborn, the newborn, and the infant in arms), and nēpios (G3516, "infant, not yet speaking"). All three are well-attested — they appear roughly 50, 8, and 15 times respectively. The word for baptism (baptizō, G907) appears 81 times across 66 verses.
The co-occurrence of baptizō with any of those three infant words, in the same verse, across the entire New Testament: zero.
Meanwhile, baptizō pairs with pisteuō ("believe," G4100) in five verses, with metanoeō ("repent," G3340) in one, and with exomologeō ("confess," G1843) in two. The verb naturally joins itself to the prerequisites. It never joins itself to the vocabulary of infancy.
What Peter says baptism is
1 Peter 3:21 gives the most explicit definition of baptism anywhere in the New Testament, and it settles the question from the other direction:
"Baptism, which corresponds to this, now saves you — not as a removal of dirt from the body, but as an appeal to God for a good conscience, through the resurrection of Jesus Christ." — 1 Peter 3:21
Peter uses the word eperōtēma (G1906) — a directed, conscious speech-act, an appeal or pledge made from a person's own conscience (syneidēsis, G4893) to God. A pre-cognitive infant does not have an operative conscience in this sense. Peter's definition places the rite beyond what an infant can do.
The text names a capacity, not an age
The text never says "baptize at eight days" or "wait until twelve" or "wait until twenty." It names the capacity — hearing, believing, repenting, confessing, appealing — and leaves it to pastoral judgment to recognize when a particular child has genuinely developed that capacity. A seven-year-old who understands sin, trusts Christ, and can say so is a different case from a seven-year-old who is performing a script. The text calls for the real thing. It calls for a repentance and a faith and a conscience-appeal that can be honestly assessed.
The full study walks every NT baptism passage in grammatical detail, examines the household texts, and traces the OT vocabulary of "not yet knowing good from evil" (Deuteronomy 1:39; Isaiah 7:15–16) that Hebrews 5:13–14 picks up in Greek.
Does Acts 2:39 mean infants get baptized?
Acts 2:39 extends the promise of the gospel to children — genuinely and without qualification. But it does not modify the baptism command in verse 38, which requires repentance first. The promise reaches children; the command to repent still stands for each individual.
Does the Bible say to baptize whole households?
The New Testament records five household baptisms, and they are real — Luke uses 'the whole household' with deliberate weight. But when the texts describe what is happening inside those households, the picture is always of conscious participation: relatives hearing, a household believing, servants devoting themselves to service. The silence about infants is silence, not authorization.
What is the age of accountability in the Bible?
The Bible never specifies an age number, but it describes a developmental threshold — the capacity to know good from evil — that appears in Deuteronomy, Isaiah, Jonah, and Hebrews. Below that threshold, the child is not yet held accountable; above it, moral responsibility is real.