All children who are under 5 years old or weigh less than 40 pounds must be seated in the back seat of the car if the car has passenger-side airbags. However, if the child's car seat is airbag-compatible, then the child can be seated in the front seat.Know More
DMV.org notes that all children who are under 8 years old and weigh less than 80 pounds must use a car seat or booster when riding in a car. If the child turns 8 years old before weighing 80 pounds, or if the child weighs 80 pounds before turning 8 years old, he can switch to a passenger seat belt. This depends on which scenario occurs first.