A child car seat is one of the most effective safety devices ever made, but only when it's installed and used correctly. Studies repeatedly find that a large share of seats are fitted wrong in ways that reduce their protection, and most of those mistakes are easy to avoid once you know what to check.
Match the Seat to the Child
- Rear-facing: the safest position for the youngest children; keep them rear-facing as long as the seat's height and weight limits allow.
- Forward-facing with a harness: the next stage, once they've outgrown rear-facing.
- Booster: positions the adult seat belt correctly until the child is big enough for the belt alone.
Resist rushing to the next stage; each one protects longer than parents often assume.
Install It Tight
Use either the lower anchors or the seat belt to secure the seat, not both unless the manufacturer allows it. Once installed, grab the seat at the belt path and try to move it; it should not shift more than about an inch in any direction. A loose seat is the most common mistake. For forward-facing seats, always use the top tether, which sharply limits how far a child's head moves in a crash.
Harness the Child Correctly
The harness straps should be snug enough that you can't pinch a fold of webbing at the shoulder. The chest clip belongs at armpit level, not on the belly. Remove bulky coats, which compress in a crash and leave the harness loose; a blanket over a buckled child is safer.
Check Your Work
Read both the seat's manual and your car's owner manual, since they work together. Many communities offer free inspection stations where a certified technician checks the install. A few minutes confirming a tight, correctly used seat is the best safety investment a parent can make.