Brandy Jaynes, 36, starved the boy until he weighed just two stone when he was rescued.
Court reports have revealed how depraved Jaynes kept her son prisoner inside the family’s upstairs bathroom for 2 years.
At the time her son was found “resembling a World War II concentration camp victim” when he was discovered unable to stand up on his own.
Investigators believe he was likely kept in darkness in the filthy bathroom.
The boy’s two brothers told police he had been in there at least a year and they had not even spoken to him through the door in the last six months.
A Lieutenant explained how a baby monitor had been set up so that people outside the room could speak to him and tell him what to do.
The little boy spent several weeks in Dixie Regional Medical Centre recovering after his father found him locked up and covered by a blanket.
He weighed less than 30 pounds which is considered by the Centers for Disease Control to be the average weight for a two-year-old.
A police statement described the bathroom as being covered in faeces and that the toilet was “full to the point that you could not see any water”.
Cops also found bolts on the door so it could be locked from the outside Lieutenant Crouse added: “It would be my definition of a torture room “There was faecal matter and urine of the floor, there was open cans of food with spoons in some of them.
She was sentenced on Monday to 15 years at Utah State Prison after pleading guilty to multiple child abuse charges.
In sentencing the judge said: “Anything less in this case would not be in the interests of justice”