Police say Blake Barrone died last weekend after drinking with his cousins, 19-year-old Todd Trosper, 19-year-old David Dwyer, Jr. and 18-year-old Jared Hook.
The three were arrested Saturday and originally charged with unlawful alcohol consumption.
Winnebago County State's Attorney Paul Logli says he has decided to add endangering the life or health of a child and giving liquor to a person under the age of 21.
The first charge is punishable by two to ten years in prison. The second is punishable by one to three years in prison.
Court appearances for the misdemeanor charges have been scheduled for July 22. No date has been scheduled for the felony charges.
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