Jesus told the Pharisees that, “If you were blind, you would not ever have sin. But now you say, ‘We see’, then your sin remains.” John 9:41
In other words, if any of His hearers had been incapable of seeing, they would not have been guilty of sin. Jesus is not referring to physical eyesight, but the ability to perceive and comprehend what sin is. Without that ability, a person does not have sin.
An infant is born completely incapable of such perception and comprehension, and lives a significant time before possessing those abilities. Consequently, an infant does NOT have sin at birth, nor does a child, until that time when they are capable of seeing, and comprehending what they see...
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