Convicted child killer Lacey Spears will serve her sentence of 20 years to life at the Bedford Hills Correctional Facility in Westchester.
Spears, who once lived in Rockland, was transferred to the maximum security prison after she was sentenced last week.
She was found guilty of fatally poisoning her 5-year-old son, Garnett, by placing lethal amounts of salt in his feeding tube.
Lawyers for Spears say they will appeal the decision.