Wisconsin state law requires that children under age 4 and under 40 pounds be restrained in an appropriate, federally approved car seat. Children under the age of 1 and weighing less than 0 pounds must ride in a rear-facing car seat. The law in Wisconsin further requires that children use a car seat or booster seat until they reach the age of 8, weigh more than 80 pounds, or are taller than 4'9". All other drivers and passengers must wear a seat belt.
All children under age 8 must ride in the back seat if the vehicle is equipped with one. There are no exemptions allowing a child to be removed from the car seat during travel for diapering or feeding.