Install the infant car seat and check it like a pro

01What you need

• A rear-facing infant car seat with a label showing its date and model numberHave
• The car seat manual and your vehicle owner's manualHave
• The seat's registration card, or your phone for online registrationHave
• A doll or rolled towel to practice the harness onHave

Where: In the car you'll drive the baby home in, parked somewhere flat, or in a garage, with room to open the back doors. Do it weeks before the due date.

02Steps

1. Read both manuals first

   YouSit in the car with the car seat manual and the vehicle manual. Find where the lower anchors are, how your seat belt locks, and which seats your car seat maker allows. Every seat and every car is different, so the manuals beat any video. About fifteen minutes.

2. Base in the back, facing the rear

   YouPut the base in the back seat, facing the rear. Pick the spot where you can get it tightest, with either the lower anchors or a locked seat belt, following the manual. The middle is good if it fits tightly there; a side seat is fine if it doesn't.

3. Tighten it and do the 1-inch test

   YouPress down hard on the base with one hand and pull the strap or belt tight with the other. Make sure nothing is twisted. Then grab it at the belt path and tug: it shouldn't move more than 1 inch side to side or front to back.

4. Check the angle

   YouFind the recline indicator on the seat or base and adjust until it reads right for a newborn. The angle keeps the baby's head from flopping forward. Then click the carrier into the base and pull up on it to be sure it's locked.

5. Practice the harness and the pinch test

   YouUse a doll or rolled towel. Straps go through the slots at or below the shoulders, lying flat. Buckle, tighten, then try to pinch the strap at the shoulder: if you can pinch any slack, tighten more. Slide the chest clip up to armpit level. Coats and blankets go over the buckled harness, never under.

6. Book a free inspection

   YouSearch NHTSA's car seat inspection locator by ZIP code (nhtsa.gov, Car Seats and Booster Seats, Installation Help). Certified technicians check your seat free in most cases and show you how to install and use it; some do virtual checks. Say, "I've installed it myself. Can you check it and watch me buckle in a doll?"

7. Register the seat

   YouMail the registration card or register on the maker's website, so they can reach you about a recall. You can also get car seat recall alerts by email or NHTSA's free SaferCar app. Put the manual in the seat's storage slot or the glove box.

03If it stalls

• If you can't get it under 1 inch of movement, try the other method (lower anchors or seat belt) or a different seating position, then take it to a technician.
• If the baby slumps sideways, rolled blankets can go on each side of the shoulders and head. Never put padding under or behind the baby unless the seat maker made it for that seat.
• If you switch cars or the base gets moved, do the 1-inch test again before the baby rides.
• If you can't find an inspection station near you, NHTSA points to Safe Kids Worldwide for help finding a technician.

04Variations

05Sources

• AAP car seat guidance. AAP says all infants should ride rear-facing starting with the first ride home, that the back seat is safest for all children under 13, never to place a rear-facing seat in front of an active front passenger airbag, to install the seat tightly so it moves no more than an inch at the belt path, to set harness slots at or below the shoulders with no slack you can pinch and the chest clip even with the armpits, to use the recline indicator, that bulky coats compress in a crash so coats or blankets go over the buckled harness, to avoid seats that are too old, cracked, missing labels, instructions or parts, recalled, or in a moderate or severe crash, that a certified CPST can help with installation, ideally before the birth, and to register the seat for recalls. American Academy of Pediatrics (HealthyChildren.org) Checked Oct 15, 2026
• NHTSA: inspection and registration. NHTSA says children under 1 should always ride rear-facing and kids should ride in the back seat at least through age 12, to read the car seat and vehicle manuals before installing, that certified technicians at inspection stations (searchable by ZIP code) will inspect your seat free of charge in most cases and some offer virtual inspections, to try Safe Kids Worldwide if no station is near, and to register the seat with the manufacturer by card or website and sign up for NHTSA recall alerts by email or the SaferCar app. National Highway Traffic Safety Administration Checked Oct 15, 2026
• NHTSA: installing a rear-facing seat. NHTSA's step-by-step guide says to place the seat or base rear-facing in the back seat, install it with a locked seat belt or the lower anchors with no twists, press down and tighten so it can't move more than 1 inch side to side or front to back, set the correct recline angle, route harness straps through slots at or below the shoulders and tighten until you can't pinch extra material at the shoulder, place the chest clip at armpit level, put coats or blankets over the buckled harness, use small rolled blankets beside the shoulders and head if support is needed, and never add thick padding under or behind the baby unless the maker recommends it. National Highway Traffic Safety Administration Checked Oct 15, 2026