The baby, a 9-month-old boy, was not hurt, but was taken to Children's Hospital of Philadelphia as a precaution, where he was in stable condition, police said.



The police Accident Investigation District said Tuesday that Procaccino was the baby's grandmother.



The bus was traveling south on 23rd Street and was trying to make a left turn onto Chestnut when it struck Procaccino, who was walking south on 23rd in the crosswalk, police said. She and the bus had a green light.



The bus driver didn't see her, police said.



Procaccino, of the unit block of Strathmore Drive, suffered severe internal injuries and was pronounced dead at the scene shortly afterward by medics.



The bus, driven by a 32-year-old woman, had three passengers on board at the time. No one on the bus was injured.



No one answered the door at Procaccino's home Tuesday.