Police say it all began when a woman approached 39th district officers around 10:30 p.m. Monday in the 2200 block of Lehigh Avenue.
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According to investigators, that woman told police her daughter's friend placed her newborn baby son inside a dumpster.
That woman said she went to the dumpster, retrieved the baby, then notified police.
The baby was taken to Temple University Hospital but was pronounced dead a short time later.
Police say they found the teen, and her mother, inside her home. Investigators believe that's where the teen gave birth.
The teen and her mother were taken to the Special Victim's Unit. The teen girl was placed under arrest and was then taken to Temple University Hospital for precautionary medical treatment.
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Homicide detectives are now investigating.
The names of those involved have not been released.