Children, even infants, don’t need to be taught how to sin: it comes naturally to them… throwing temper tantrums because they can’t get their own way, hitting other toddlers in the playgroup, claiming something as ‘mine’ and not sharing! Mild stuff, granted, compared to what we might generally consider sin but nevertheless sin, all sin, is rebellion against God’s perfect standard. When God says, ‘love your neighbour as yourself’, and we don’t, we sin. And if we only ever sinned once in our entire life then, by default, we’re not innocent, not 100%, and God, who is absolute pure 100% holy cannot be where sin is! It’s like trying to mix oil and water… impossible!