Almost all Baptist churches practice “adults-only” baptism—more accurately, “believers’ baptism,” meaning they only baptize persons old enough to voluntarily ask for baptism and make a profession of faith in Christ. In practice, this can happen as young as five years old.
Baptists point out that infant baptism is involuntary on the part of the child, who is not making a conscious choice to become a Christian. They point out—correctly—that baptisms in the New Testament were performed on believers, not on infants.