The jail sentences handed to the killers of Arthur Labinjo-Hughes have been referred to the Court of Appeal.
Attorney General Suella Braverman said the sentences handed to Emma Tustin and Thomas Hughes were believed to be too low and should be reviewed.
Emma Tustin, 32, was convicted of the murder of her six-year-old stepson, Arthur, and the victim’s father, Thomas Hughes, 29, was convicted of his manslaughter. Both offenders were also convicted of child cruelty.
READ MORE: Parents found guilty of killing boy, 6, who cried out for love and food
Tragically, young Arthur was left with an unsurviveable brain injury while in the sole care of his father's "evil" partner.
She was jailed for life with a minimum term of 29 years at Coventry Crown Court on December 3, after being convicted of murder by assaulting defenceless Arthur in the hallway of her Cranmore Road home in Solihull, on June 16, 2020.
Arthur, whose body was also covered in 130 bruises, died in hospital the next day.
The young boy was routinely subjected to physical violence and ill-treatment and he was deliberately deprived of water and poisoned with salt.
"Manipulative" and "calculating" Tustin was unanimously convicted after an eight-week trial trial, with the boy's "pitiless" father Thomas Hughes, 29, found guilty of his manslaughter, after encouraging the killing.
Hughes' "infatuation" for Tustin had "obliterated" any love for his son, sentencing judge Mr Justice Mark Wall QC said, and jailed him for 21 years.
Referring the case to the Court of Appeal, Ms Braverman said: "This is an extremely upsetting and disturbing case, involving a clearly vulnerable young child."
She added: "Emma Tustin and Thomas Hughes grossly abused their position of trust and subjected an innocent child, who they should have been protecting to continued emotional and physical abuse.
"I understand how distressing the public have found this case, but it is my job to decide if a sentence appears to be unduly lenient based on the facts of the case.
"I have carefully considered the details of this case, and I have decided to refer the sentences to the Court of Appeal as I believe them to be too low."
A date for the hearing at the Court of Appeal is yet to be set.
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