Mother Lisa Brooks, 25, and stepfather Tomas Lewis, 22, were jailed on Saturday for locking their child in a tiny bare room with no lights or heating.
A court heard that the boy was "hours away from death" - suffering from starvation and dehydration when he was rescued and taken to hospital.
He was discovered just three weeks before Christmas 2010 at Trevethin, near Pontypool, South Wales, after a social worker received anonymous tip-offs.
The boy has since been adopted by a foster family and shows no signs of psychological damage.
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