Kelly Emery gave Fenton Hogan the heroin substitute to "knock him out" while she took cocaine
A mother who killed her son by feeding him methadone to make him sleep has been jailed for six years.
Kelly Emery, 34, gave two-year-old Fenton Hogan the heroin substitute to "knock him out" while she took cocaine.
Emery, of Cotswold Close, Frankley, Birmingham, had denied administering the substance but was found guilty of manslaughter at Nottingham Crown Court.
The jury cleared her of a separate charge of cruelty to a person under the age of 16.
The trial heard Emery gave the heroin substitute to Fenton on at least three occasions before his death in July 2013.
Jerry Hayes, defending, said Emery loved her son and would not have done anything to harm him.
She admitted manslaughter by gross negligence but the jury concluded she deliberately gave the drug to him and so was guilty of the more serious charge.
Jurors were told Fenton was pronounced dead after being taken to hospital from Emery's former home.
Speaking after the sentence, Det Insp Bob Sutton said the toddler "should have had the rest of his live to look forward to".
"Instead his short life was taken by the actions of his mother, who should have been there to safeguard and protect him," he said.
Det Insp Sutton said Emery's daily routine "revolved around the consumption of drugs".
"Fenton's extended family agrees that no sentence is sufficient or will help to heal what happened to Fenton. The impact of Kelly's actions will remain with all of the family forever," he added.