UPDATED: 6:49 p.m.
This happened around 1 p.m. on Kendrick Street near Torresdale Avenue, in the city's Holmesburg neighborhood.
Police said the child was taken to Jefferson Torresdale Hospital with a gunshot wound to his chest. He was pronounced dead at 1:36 p.m.
Commissioner Danielle Outlaw told NBC10 Philadelphia there were several children inside the home at the time of the shooting.
Neighbors said there had been "a lot of trouble" at the house.
A 37-year-old woman was shot at least a dozen times and killed in North Philly, on Clearance Street near Tioga. She is currently in stable condition.
And two men are recovering after police said they were shot in Fairmount, near 18th and Wallace Streets.