Do place the safety seat in the back seat of the vehicle.
Do attach the safety seat to the vehicle using safety belts and/or anchors.
Do secure the child snugly in the safety seat using the safety seat harness.
Do position the safety seat harness clip at the child's armpit level.
Do choose the appropriate safety seat for your child's weight and age:
Don't install the seat in the vehicle too loosely: you should not be able to move the seat an inch or more sideways or forward.
Don't place infants in forward-facing seats too soon: rear-facing seats are the proper choice for children younger than 12 months and/or lighter than 20 pounds.
Don't improperly route or adjust the safety seat harness.
Don't improperly position the retaining clip.
Don't stop using booster seats too soon - booster seats are appropriate for children up to 10 years old.