The child was airlifted to Loyola University Medical Center in Maywood in critical condition.
No students were on the Indian Prairie School District bus, officials said, when it crashed around 9:20 a.m. at Lapp Lane and 248th Avenue near the Aurora border.
A woman and a second child in the SUV, as well as the school bus driver, were taken to Edward Hospital in Naperville with non-life-threatening injuries. The driver of the SUV had to be extricated from the wreckage after it landed upside down in a ditch.
The bus crashed into a tree.