Police and medic units were called out to a home on the 5400 block of Eastwick Terrace in Southwest Philadelphia around 2:00 p.m. Wednesday for a report of an unresponsive child.
A medic unit transported the child to Children's Hospital where he was pronounced dead minutes later.
Investigators say the child was found with blood in his nose and on the bed.
A detective on the scene told Action News the death looks suspicious, in part because of that blood. Police also say the parents told them the boy did not feel well on Tuesday night, and did not go to school on Wednesday because everyone overslept.
According to the Medical Examiner, the autopsy performed Thursday on the child came back with results that showed no apparent signs pointing to a homicide.
Additional lab tests will now take place to determine the definitive cause of death. Police await to hear those results as a homicide has not been ruled out completely.
Investigators also say the boy did not have any significant health issues.
However, detectives said the child could have died of natural causes.
Neighbors didn't know much about the family, saying they had just moved in a few weeks ago.
The name of the boy has not been released.