Read the manufacturer's instructions for your car seat.
Face the seat in the proper direction.
Infant seats always face backwards; baby rides in a semi-reclining position facing the rear of the car.
Convertible seats face backwards in a semi-reclining position for infants under 20 pounds and under 1 year of age, and forward in an upright position for toddlers.
Always buckle the seat's harness system securely to hold your child safely in the seat. Allow no more than one finger-width of slack between your child's collarbone and the harness strap.
Secure the child seat with a seat belt.
Anchoring the seat properly with a seat belt is critical. A seat that is not buckled securely to the car can tip over, slide sideways or, in a crash, be ejected from the car.
Check your instructional manual to find out how to route the seat belt properly and fasten it tightly.