15-year-old Jani Morris has been charged as an adult.
She is also charged with endangering the welfare of a child, possession of an instrument of crime, and abuse of a corpse.
ORIGINAL STORY: Girl, 15, arrested following death of baby found in Philadelphia dumpster
The newborn baby boy was pronounced dead at Temple University Hospital after he was found late Monday night.
Police said it all began around 10:30 p.m. when a woman approached officers three blocks away from where she had discovered the newborn in a dumpster.
Detectives say the woman informed them the baby had been placed there by Morris, a friend of her daughter.
Police say they found the teen and her mother inside their nearby home. Investigators believe that's where the teen gave birth.
The teen and her mother were taken to the Special Victims Unit.
The teen girl was placed under arrest and was then taken to Temple Hospital for precautionary medical treatment.