How old do you have to be to not have to use a booster seat in Iowa?

In Iowa, children are required to use a booster seat until they are at least 6 years old and weigh 48 pounds. However, it is recommended that children use a booster seat until they are tall enough to properly fit in a seat belt, typically when they reach about 4 feet 9 inches in height. Always check for the latest regulations, as laws may change.