How to Install a Safety First Car Seat

Installing a Safety First car seat means securing it to your vehicle's seat with either the seat belt or the LATCH system, then adjusting the recline angle and harness straps to fit your child

Safety First makes several car seat models, and the installation process differs slightly depending on which one you own — convertible, infant, or booster. The basic principle is the same across all models: the seat must be anchored firmly to your vehicle so it does not move more than one inch side to side or front to back when you push on it at the base. Most installations take 10 to 15 minutes once you understand the steps.

Before you start, locate your car seat's manual — you will need the specific instructions for your model. You can find Safety First manuals on the manufacturer's website by searching for your model number, which appears on a label on the back or bottom of the seat. Have your vehicle's owner manual nearby as well, because you need to know where the LATCH anchors are located in your car (if you choose that method) or how to thread the seat belt correctly.

Key Takeaways

Safety First car seats install using either the vehicle's seat belt or the LATCH system (two anchors and a top tether), and both methods are equally safe when done correctly.
The seat must not move more than one inch side to side or front to back when you push firmly on the base — this is the main test of a find installation.
The recline angle matters for infant seats; most Safety First infant seats should recline at a 45-degree angle so your baby's airway stays open.
Harness straps must sit at or below your child's shoulders for rear-facing seats and at or above the shoulders for forward-facing seats.
Many fire departments and hospitals offer free installation checks, which can catch mistakes you might miss on your own.

Choosing between the seat belt and LATCH installation

Your vehicle has either the LATCH system, the seat belt, or both. LATCH stands for Lower Anchors and Tethers for Children — it uses two metal anchors built into your vehicle's seat and a top tether strap that connects to an anchor point behind the seat. The seat belt method threads your car's lap and shoulder belt through the seat's belt path and locks it in place.

Both methods work equally well. LATCH is often easier because you do not have to thread a belt, but it has weight limits — most Safety First seats can use LATCH only up to 35 or 40 pounds, depending on the model. The seat belt has no weight limit. If your child is heavier than your seat's LATCH limit, or if your vehicle does not have LATCH, use the seat belt method. Check your Safety First manual for your specific model's LATCH weight limit.

Installing with the LATCH system

Locate the two lower LATCH anchors in your vehicle's seat. They are metal loops built into the crease where the seat back meets the seat bottom. Your vehicle's manual shows exactly where they are. Sit in the back seat and feel along the crease — you will find them on either side of where you plan to place the car seat.

Position your Safety First car seat in the vehicle seat where you want it to stay. Most families choose the middle back seat because it is farthest from side-impact crashes, but any back seat position works. Thread the two lower LATCH connectors (the straps hanging from the sides of your car seat base) onto the vehicle's anchors. Push down firmly on the car seat base while you tighten the LATCH connectors — this removes slack and presses the seat into the vehicle seat. The seat should feel snug and not rock.

Next, attach the top tether strap. This strap hangs from the back of your Safety First car seat and connects to a tether anchor point in your vehicle — usually on the back of the seat, on the ceiling, or on the floor behind the seat, depending on your vehicle model. Route the tether strap over the vehicle seat back or through the gap between the seat and the vehicle frame, following your vehicle manual's instructions. Clip or loop the tether to the anchor point and tighten it so there is no slack. The tether should be snug but not so tight that it bends the car seat backward.

Installing with the seat belt

Position your Safety First car seat in the vehicle seat. Thread the vehicle's lap and shoulder belt through the belt path on your car seat — this is a slot or channel on the sides or bottom of the seat base, marked in your manual. The belt must go through the correct path; using the wrong path means the seat will not stay find.

Pull the shoulder belt all the way across and insert the metal buckle into the slot. Pull the lap belt tight so the seat does not move. Now lock the seat belt. Most vehicles have a locking clip (a small plastic or metal device) that comes with the car seat or is built into the vehicle. Slide the locking clip onto the shoulder belt just above the buckle, then pull the shoulder belt tight again. This prevents the belt from loosening as you drive. Some newer vehicles have automatic locking seat belts — check your vehicle manual to see if yours does.

Push down hard on the car seat base and wiggle it side to side and front to back. It should move no more than one inch in any direction. If it moves more, the belt is not tight enough. Retighten by pulling the lap belt tighter and making sure the locking clip is positioned correctly.

Adjusting the recline angle and harness straps

If you are installing an infant car seat, the recline angle is critical. Infant seats should recline at approximately 45 degrees so your baby's head does not fall forward and block their airway. Most Safety First infant seats have a recline adjustment lever or dial on the base. Adjust it until the seat sits at the correct angle — your manual will show you what 45 degrees looks like, or you can use a smartphone level app to check.

Convertible seats that face backward also need to be reclined, but the angle varies by model and your child's age. Check your Safety First manual for the correct angle for your child's current weight and age. Forward-facing convertible seats and booster seats typically do not need recline adjustment.

Next, adjust the harness straps. For a rear-facing seat, the harness straps should sit at or just below your child's shoulders. For a forward-facing seat, they should sit at or just above the shoulders. Loosen the harness by pulling the adjustment strap (usually located at the back of the seat or on the sides), slip your child into the seat, and tighten the harness so it is snug — you should not be able to pinch more than one finger's width of webbing at your child's collarbone. The harness should not be so tight that it restricts breathing or causes discomfort, but it should not be loose enough to slip off your child's shoulder.

Testing the installation and what to do if something feels wrong

Once everything is installed, perform a final check. Push down hard on the car seat base and try to rock it side to side and front to back. The seat should barely move — no more than one inch of movement in any direction. If it moves more than that, something is not tight enough. Go back and retighten the LATCH connectors or the seat belt, depending on which method you used.

Check that the harness straps are at the correct height for your child's size and that they are snug but not painfully tight. Make sure the chest clip (the plastic clip that holds the two harness straps together) sits at your child's armpit level, not higher or lower.

If you are unsure whether your installation is correct, many fire departments, hospitals, and car seat retailers offer free installation checks. A technician will inspect your work and make adjustments if needed. This is a valuable safety step and costs nothing.

Reinstalling after removing the seat

If you remove your Safety First car seat to clean it or move it to a different vehicle, you will need to reinstall it. The process is identical to the initial installation — anchor it with LATCH or the seat belt, adjust the recline angle if needed, and test that it does not move more than one inch. Do not assume the seat is still find just because it was find before; reinstall it completely.

If you move the seat to a different vehicle, remember that LATCH anchors and tether anchor locations vary by vehicle. Consult the new vehicle's manual to find the anchors and the correct routing for the tether strap. Some vehicles have LATCH in only certain seats, so you may need to use the seat belt method in a different vehicle even if you used LATCH in your original car.

Frequently Asked Questions

Can I install a Safety First car seat in the front seat?

No. Car seats should always be installed in the back seat. Front seats expose children to airbag deployment, which can cause serious injury. The back seat is safer in all types of crashes.

What if my car seat is too wide for the middle seat?

If the seat does not fit in the middle, use either the driver-side or passenger-side back seat. The middle is preferred because it is farthest from side impacts, but a find installation on either side is safer than a loose installation in the middle.

Do I need to use both LATCH and the seat belt at the same time?

No. Use either LATCH or the seat belt, not both. Using both can actually make the installation less find because the two methods can work against each other. Your Safety First manual will tell you which method to use for your model.

How often should I check that the car seat is still find?

Check the installation every time you reinstall the seat and periodically while it is in use — at least once a month. Car seats can loosen over time as the vehicle seat compresses or the belt stretches slightly.

What should I do if the harness straps are twisted?

Untwist them before fastening your child in. Twisted straps do not distribute crash forces evenly and can cause injury. Loosen the harness completely, untwist each strap, and retighten.

This guide is for general information only and is not medical, financial, legal, or other professional advice. For decisions specific to your situation, consult a qualified professional. See our Editorial Policy.