To be born again is not found, anywhere in scripture, as being in reference to water baptism!
Being “born” is in reference to the word “again,” someone who will be born again, or a second birth, literally obtaining a “new life.”
This is NOT just a changed lifestyle within the same physical body, as would be expected of all obedient saints of God, but a totally new life & new body, which will only occur after our current physical life (this corruptible body or seed= flesh) has ended.
Our next life (or this new birth experience) occurs at the resurrection as it did with Christ, “who being the firstborn among many brethren” (Romans 8:17) from the dead (Rev 1:5). Peter styles it somewhat like this, (having an incorruptible seed= God’s Spirit) (1Peter 1:23).
(See: FAQ, Born Again)