Are Children 4 to 5 years old are required by law to be secured in a federally approved separate booster or integrated child seat?

Yes, in the United States, children aged 4 to 5 years are generally required by law to be secured in a federally approved child safety seat, which can be either a booster seat or an integrated child seat, depending on the child's size and weight. Each state has its own specific laws regarding child passenger safety, so it's important to check local regulations. These laws are designed to enhance safety and reduce the risk of injury in the event of a car accident.