At what age must a child be in a car seat until?

In Wisconsin, the law requires that children are to be secured in a car seat until they reach the age of 4. This regulation is in place to ensure the safety of young passengers, as appropriate car seats significantly reduce the risk of injury in the event of a crash. Up to this age, children should be placed in a forward-facing car seat once they outgrow the rear-facing car seat, ensuring they are always secured according to their size and weight specifications. After the age of 4, children may continue to use a booster seat until they reach a certain height or weight, typically until they are 8 years old, but the requirement to be in a car seat specifically ends at age 4.