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Installing the Car Seat Before the Baby Arrives: A Checklist

Babies do not always keep to the due date. Get the seat installed, checked and registered while there is time.

Updated October 2026 · 7 min read

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Bottom line

Install the seat well before your due date: read both manuals, install it, practice buckling a doll, book a certified technician and register the seat. AAP says infants should ride rear-facing from the first trip home from the hospital, so the seat has to be ready before you need it.

The first ride home is the one with the least margin for a practice run. A seat installed and checked weeks earlier turns that ride into a routine one. This is a sensible order.

Timeline

WhenTask
As soon as you have the seatCheck the label, register it, and read both manuals.
Several weeks before the due dateInstall it, practice the harness and book a technician check.
At the technician visitBring the vehicle, the seat and both manuals.
Before the hospital bag is packedConfirm the seat is installed, the harness is set for a newborn and the manual is in the bag.

Step by step

  1. Read both manuals. AAP says to read the car seat manual and the vehicle owner's manual before every installation. NHTSA's rear-facing guide tells you to learn where your vehicle's lower anchors are and how its seat belt locks.
  2. Choose the position. AAP says the back seat is the place for all children under 13. The center may be best, but only if the seat can be installed tightly there. See installing without LATCH if your vehicle lacks anchors.
  3. Install with one method. NHTSA says to use either the lower anchors or the vehicle seat belt. If you use the belt, lock it as the vehicle manual describes. The seat manual lists the methods it allows.
  4. Set the recline. Most rear-facing seats have an angle indicator or adjuster, and the angle may need changing as the baby grows. See recline angles.
  5. Test the install. NHTSA says the seat should not move more than one inch side to side or front to back when you pull at the belt path. Press down firmly while you tighten.
  6. Attach the carrier. For an infant seat, NHTSA lists clicking the carrier into the base as the last step.

Practice the harness

Use a doll or a stuffed animal of similar size to practice. Rear-facing, the harness straps sit at or below the shoulders. Buckle the harness and chest clip and tighten until you cannot pinch extra webbing at the shoulder, which is NHTSA's check. The chest clip goes at armpit level, according to NHTSA and AAP. Practice with winter layers as well if the baby is arriving in cold weather; check the manual for what may be worn under the harness.

Book a technician check

NHTSA says certified technicians usually inspect seats free of charge, and some locations offer virtual inspections. Ask how far ahead appointments book, since slots near you may fill. Our CPST guide explains how to find one. If you installed with the belt, ask the technician to show you how your vehicle's belt locks.

Rear-facing space and airbags

A rear-facing seat takes room behind the front seats, so adjust the front seat to suit and check that the driver and front passenger still have space. AAP says never to place a rear-facing seat in front of an active passenger airbag, which is one more reason the back seat is the answer. Sit in the driver's seat with the seat installed to confirm you can drive comfortably.

Register and check the label

NHTSA recommends registering the seat with the manufacturer, by mailed card or online, so the maker can contact you about recalls and safety notices. The label shows the model number and manufacture date; AAP says to check the maker's lifespan too. See how to read the labels. If you have not chosen a seat yet, our registry checklist covers the choice.

Hospital day

A second vehicle changes the plan. A grandparent's car needs its own manual read and its own install. Do not assume the first install carries over.

Sources and verification

Common questions

When should I install the car seat before my baby is born?

Several weeks before the due date is a sensible target, since babies can arrive early. Install it, have a technician check it and register it.

Do I need to read the vehicle manual too?

Yes. AAP says to read both the car seat manual and the vehicle owner's manual before every installation, because anchor locations and belt locking vary.

Where in the car should I install an infant seat?

In the back seat. AAP says the center may be best only if the seat installs tightly there; otherwise a side position is fine. The vehicle and car seat manuals decide.

How tight should the installed seat be?

NHTSA says the seat should not move more than one inch side to side or front to back when pulled at the belt path.

Can I get my installation checked for free?

NHTSA says certified child passenger safety technicians usually inspect seats free of charge, and some offer virtual inspections.

Car Seat Guide is reader-supported. When you buy through links on this page we may earn a commission, at no extra cost to you. That never decides what we recommend. This article is general education, not a substitute for your car seat manual, your vehicle manual, AAP and NHTSA guidance, or an in-person check by a certified technician.