They can be used in the front or rear of the car. It is safer to put them in the rear. DO NOT put them in the front passenger seat if there is a passenger airbag. Rearward-facing seats provide greater protection for the baby's head, neck and spine than forward-facing seats. So, it is best to keep your baby in a rearward-facing seat for as long as possible. Only move them to a forward-facing seat once they have exceeded the maximum weight for the baby seat, or the top of their head is higher than the top of the seat.