Final answer:
Federal safety guidelines require the use of safety seats for infants and young children in motor vehicles.
Step-by-step explanation:
Federal safety guidelines regarding safety seats aim to protect children in motor vehicles. These guidelines require the use of safety seats for infants and young children who are too small for regular seat belts. The guidelines specify the appropriate type of safety seat based on the child's age, weight, and height, and also provide instructions for installation and proper use of the seat.