What is the law in Missouri about children riding in the front seat of a vehicle?

In Missouri, children under the age of 8 must be secured in an appropriate child safety seat or booster seat in the back seat of a vehicle, unless the back seat is occupied by younger children under 8 or the vehicle has no back seat. It is recommended that all children under 13 years old ride in the back seat whenever possible, regardless of the state's specific law.