Lovily Johnson, 23, from Michigan, USA, left her 6-month-old baby Noah in her car seat for days without any food or water and the air conditioning was left off.
Police said the temperature in the attic bedroom hit 32C.
Johnson was sentenced to between 20 and 80 years behind bars.
During sentencing Judge Mark Trusock at a Kent County Circuit Court described her actions as “outrageously disturbing”.
Judge Trusock added he hoped she never had the opportunity to have another child.
Johnson’s four-year-old daughter has been taken into care.
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