The Playbook

Car seat stage finder

Enter your child's age, weight and height (and your seat's limits from its label). You'll get the right stage, why, and what has to happen before the next one.

1 year, 0 months
Your seat’s limits (from the label on the seat)

Defaults are typical convertible-seat limits. Your seat’s label and manual always win; many seats also have a rule about head clearance from the top of the shell.

Stage 1 of 4

Rear-facing car seat

Rear-facing spreads crash forces across the back, neck and head. Keep your child rear-facing until they hit the seat’s rear-facing height or weight limit, even if their legs touch the seat back.

  • Still under the rear-facing limits (40 lb, 40 in). AAP recommends staying rear-facing as long as the seat allows.

Next stage: At 40 lb or 40 in, whichever comes first.

Under 13: always ride in the back seat. Never put a rear-facing seat in front of an active airbag.

Seats commonly used at this stage (all U.S. seats must meet the same federal crash standard, FMVSS 213; fit in your car matters most):

Get your installation checked for free by a certified Child Passenger Safety Technician: search NHTSA’s car seat inspection locator.

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By the Guide to Fatherhood editorial team. Last reviewed .

Checked against guidance from organizations like the AAP, CDC, ACOG and NHS (linked below). This is general information, not medical advice. Read our medical disclaimer.

The four stages

The AAP and NHTSA agree on the order. The key idea is to stay in each stage as long as your seat allows, because each step down offers less protection.

  1. Rear-facing. From the first ride home until your child reaches the rear-facing height or weight limit of their seat. In a crash, a rear-facing seat cradles the head, neck and spine. Infant seats are outgrown first; a convertible seat lets most kids ride rear-facing well past their second birthday.
  2. Forward-facing with a 5-point harness. Until your child reaches the seat’s harness height or weight limit. Always use the top tether.
  3. Belt-positioning booster. Until the adult seat belt fits properly on its own, usually around 4 feet 9 inches and between ages 8 and 12.
  4. Seat belt, in the back seat. Children under 13 should ride in the back.

The finder applies those rules to your numbers. The 2018 AAP policy statement dropped the old “until age 2” rule in favor of “as long as possible.”

Where to find your seat’s limits

On a sticker on the side or back of the seat, and in the manual. There are usually separate limits for rear-facing and forward-facing, by weight and by height. Many seats also have a head-clearance rule: when rear-facing, the top of the child’s head must be at least an inch below the top of the shell or headrest. Whichever limit your child hits first ends that stage for that seat.

Common mistakes the finder can’t see

  • A loose install. The seat should not move more than an inch side to side or front to back at the belt path.
  • Harness too loose. After buckling, you should not be able to pinch a fold of strap at the shoulder.
  • Chest clip too low. It belongs at armpit level.
  • Puffy coats under the harness. Buckle in normal clothes, then add a coat or blanket over the top.

Get it checked for free by a certified Child Passenger Safety Technician; NHTSA has an inspection station locator. And read our car seat installation basics.

Frequently asked questions

When can my child face forward?

When they reach the highest rear-facing weight or height limit of their car seat. The AAP no longer gives a minimum age like 2; it recommends rear-facing as long as possible. Many convertible seats allow rear-facing to 40 pounds or more, which lets most children ride rear-facing past age 2.

What if my child's legs touch the back seat?

That is normal and safe. Children sit comfortably with legs bent or crossed. Leg injuries in rear-facing children are rare; head and neck protection is the reason to stay rear-facing.

When can my child use a regular seat belt?

When the belt fits properly without a booster, usually when they are about 4 feet 9 inches tall and between 8 and 12 years old. The lap belt should lie across the upper thighs, the shoulder belt across the middle of the chest and shoulder, and they should be able to sit with knees bent at the seat edge for the whole ride.

When can my child sit in the front seat?

The AAP and NHTSA recommend that children under 13 ride in the back seat. Never put a rear-facing seat in front of an active airbag.

Sources

  1. Car Seats: Information for Families, American Academy of Pediatrics (HealthyChildren.org)
  2. Child Passenger Safety: Policy Statement, Pediatrics (American Academy of Pediatrics)
  3. Car Seats and Booster Seats, National Highway Traffic Safety Administration

We link to the original source for every medical and safety claim. Guidance changes; if a source has been updated since our last review, the source wins. How we research.