Read your car seat manual, and the seat belt, car seat, and air bag sections in your vehicle manual. We can not reinforce this enough!
Install with either UAS or seat belt, not both (unless told to in your car seat’s manual).
Read your vehicle manual to make sure it’s okay to install a car seat in the spot you want it, using UAS or seat belt (you often can’t use UAS in the centre).
The centre is sometimes thought to be the safest seating position, but a solid outboard installation trumps a poor/incompatible/impossible centre installation every time.
NEVER install a rear facing car seat in front of an active airbag.
There is a weight limit when installing with UAS. Find out what it is for your vehicle and child restraint, and after that, install with the seat belt.
If installing with a seat belt, it must LOCK in some way: at the retractor, at the latch plate, with a locking clip, or with built-in lock-offs on the car seat.
Seat must have 1” or less of movement at the belt path.
Check that you’re using the correct belt path (separate ones for rear and forward facing).
By law, you MUST top tether to an APPROVED anchor point when forward facing.
Never use a car seat or booster seat that is:
expired
recalled and not fixed
crashed if it requires replacement after any crash
damaged
Be very wary when buying a used seat – you are trusting the previous owner with your child’s life
Tighten the harness enough so you can’t pinch a horizontal fold at the collarbone
Chest clip must be at armpit level
Don’t over dress your child – use thin warm layers (like fleece) and cover with blankets. Bulky clothing can result in your child being ejected in a crash.
Remove projectiles from the vehicle, and tie down or stow anything that you wouldn’t throw at your child’s face.