The child is under a year old and is doing fine, according to the Compton Sheriff's Station.
It was not immediately known how old the juvenile is, how he was able to access a firearm, where the parents were during the incident and what led up to the shooting.
The shooting happened in the 1000 block of Poppy Avenue at about 11:30 a.m.
ABC7 was told a sheriff's deputy rushed the baby to the hospital in his own vehicle.
MORE | Baby rushed to hospital after being shot in Compton
Baby rushed to hospital after being shot in Compton
No one else was injured.
The sheriff's department says it will be up to the Los Angeles County District Attorney's Office to decide whether or not criminal charges will be filed. The investigation is ongoing.