Detectives say an autopsy has revealed that the child was born alive, then murdered. But police have not disclosed precisely how.
The full-term newborn was discovered in a plastic bag at Brookfield Recycling at 18 Hayes Street in Elmsford around 3 p.m., and it appears to have been dumped in trash that came from Spring Valley.
Police are searching in the village of Spring Valley for the possible parents.
Authorities say the baby was a boy and is believed to have been Hispanic.
Westchester County Police confirm a worker at Brookdale Recycling made the gruesome discovery around 3 p.m., pulling the bag from a machine that felt strangely heavy and finding the body inside.
Investigators spent hours gathering evidence.
Two items were found with the baby - a black skirt and a towel with a floral design.
Just last month, a dead baby was found inside a Long Island trash facility.
Police say the baby girl, who still had her umbilical cord attached, was not born alive.
Also last month, security at the Victoria's Secret in Herald Square confronted 17-year-old Tiona Rodriguez, who police say had a dead baby inside her shopping bag.
Investigators say her baby boy was near full term at 8 months.
With each story comes a reminder of the state's Safe Haven law.
You can leave an unharmed newborn at any hospital, police, or fire station, no questions asked.
Police are also hoping to figure out what part of town the baby was dumped.
According to their website, Brookfield was established in 1968 and handles metal, paper, plastics, electronics and vehicle recycling.
A $2,500 reward is being offered for information leading to the arrest of the person responsible for the murder of a newborn baby found in Elmsford Tuesday. Anyone with information on the case can call the NYS Crime Stoppers hot line at 1-866-313- TIPS or go the NYS Crime Stoppers web site http://www.nyscrimestoppers.org and use the links to download the New York State Crime Stoppers Mobile App to their iPhone, Android or Blackberry and provide information directly from their phone.