The American Academy of Pediatrics (AAP)
recommends that infants ride in the back seat in a rear facing child safety seat until they are at least one year old AND weigh at least 20 pounds. Infants weighing 20 pounds or more before one year of age should ride in a safety seat rated for heavier infants (some convertible seats are rated up to 30-35 pounds rear-facing). Please remember to NEVER place a rear facing child safety seat in the front seat when a passenger air bag is present. For further information, call 1-800-800-BELT or you may wish to review Car Seats: Information for Families
from the AAP. Remember, never leave a child alone in a car, not even for a minute.