It happened around 8 p.m. on the 5500 block of North 4th Street.
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Investigators said a 23-year-old man has turned himself into police in connection to the incident.
Police said the man, who is known to the family, was playing with a group of children inside a home when for some unknown reason the gun fired.
4-year-old child shot in Olney; suspect in custody: Police
Police say the 4-year-old boy was shot in the hip and transported to Einstein Medical Center hospital where he's listed in critical but stable condition.
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According to police, the shooter initially left the scene with another man in a car.
It is unknown what, if any charges he is facing at this time.