David Logan, 22, of Chicago, who was arrested Wednesday, is charged with unlawful use of a weapon and obstructing justice, WLS-TV reported.
Logan was arrested the same day the 3-year-old boy, Deonta Howard, was released from a hospital.
Four other suspects face attempted murder and aggravated battery charges -- Bryon Champ, 21; Kewane Gatewood, 20; Tabari Young, 22; and Brad Jett, 22.
Police said more arrests are possible in the gang-related shooting that took place while people were watching a basketball game in Cornell Square Park in Chicago's Back of the Yards neighborhood, the Chicago TV station said.
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