IL HB5248

Adds a new offense for knowingly leaving an "immature child" under 18 years old unattended to Illinois's child endangerment law

Removes the fixed age threshold of 14 years for supervisors, replacing it with a "mature person" standard, with an inference that supervision by someone 18 or older is adequate

Establishes factors courts may consider when determining a child's maturity level: special needs or disabilities, duration of time left unattended, time of day or night, and the mental/physical capabilities of the supervisor

Retains existing inference that a child 6 years or younger left in a motor vehicle for more than 10 minutes is considered unattended

Maintains current sentencing structure: Class A misdemeanor for first offense, Class 3 felony for repeat offenses, and Class 3 felony (2-10 years) if the violation causes a child's death