According to research, using a seat belt in conjunction with a booster seat reduces a child's risk of injury by 59 percent.
Currently, about 80 to 90 percent of children in the united states who should be in a booster seat are not. Advocates say if children aren't restrained properly in a crash, seatbelt syndrome takes effect.
"The children and is are under tremendous forces and they bend over the seatbelt and they suffer internal injuries to the spleen and liver and some of those can be devastating," said Pam Ebel of Chippewa Valley Safe Kids.
Governor Jim Doyle has until February 15th to sign the bill.