Install your infant car seat before labor begins, ideally during your third trimester
You need your infant car seat installed and ready before you leave the hospital with your newborn — hospitals will not discharge a baby without one. Most parents install the seat during the third trimester, between weeks 28 and 36 of pregnancy. This timing gives you a buffer if you go into labor early and lets you practice the installation while you are not in active labor or managing a newborn at home.
The specific installation window depends on your situation. If you are having a planned cesarean section or induction, you can install the seat a few days before your scheduled date. If you are expecting a vaginal delivery with no complications predicted, aim for week 32 or 33. If you are carrying multiples or have a history of early labor, install by week 28.
Do not wait until after your baby is born. Hospital staff will check that your seat is installed correctly before discharge, but they will not install it for you — that is your responsibility. If you arrive at the hospital without a car seat, you will have to buy or borrow one before you can leave, which adds stress and cost when you are already managing a newborn.
Key Takeaways
- Install your infant car seat between weeks 28 and 36 of pregnancy so it is ready before labor begins.
- Hospitals require a properly installed car seat before they will discharge your baby — they will not install it for you.
- Have the seat installed in the vehicle you will use most often to bring your baby home and for regular trips.
- Ask the hospital or a certified technician to check your installation before you leave, or schedule a check-up appointment within the first week after birth.
- If you are using a hand-me-down seat, verify the expiration date and that it has never been in a crash before installing it.
What happens if you install too early
Installing your car seat months before your due date is not harmful, but it does mean the seat sits unused in your vehicle for a long time. If you install in the first or second trimester, you may forget details about how to use it by the time your baby arrives, or you may need to reinstall it if you get a new vehicle before labor.
The main risk of very early installation is that you might not notice if something is wrong with the seat — a manufacturing defect, a missing part, or damage from shipping. If you install during your third trimester, you have time to contact the manufacturer or return the seat if there is a problem, rather than discovering it when you are in active labor.
Where to install the seat in your vehicle
Infant car seats must be installed in the back seat, never in the front. The safest position is the center of the back seat, away from side-impact zones. If your vehicle does not have a center back seat (some trucks and SUVs have a center console instead), install the seat on the passenger side of the back seat, behind the front passenger seat.
If you have multiple children or plan to use the seat in more than one vehicle, install it first in the vehicle you will use most often — usually the one you drive to the hospital and use for daily trips. You can install the same seat in a second vehicle later, or purchase a second seat if you want to avoid moving it between cars.
How to get your installation checked before discharge
Before you leave the hospital, ask a nurse or hospital staff member to verify that your car seat is installed correctly. Not all hospitals have certified car seat technicians on staff, but many have nurses trained to spot common installation mistakes. If the hospital cannot check it, ask for a referral to a local technician.
If you do not have your seat installed before you arrive at the hospital, ask the hospital social worker or discharge coordinator for resources. Some hospitals have loaner seats or partnerships with local car seat programs. If you must buy a seat at the last minute, choose one with a straightforward installation — rear-facing infant seats are generally simpler to install than convertible seats.
You can also schedule a car seat check appointment with a certified technician within the first week after you bring your baby home. The National Highway Traffic Safety Administration (NHTSA) maintains a database of certified technicians by state and county at safercar.gov. Many fire departments and police departments also offer free or low-cost checks.
What to do if you are using a borrowed or secondhand seat
If you are using a car seat that was previously owned, check the expiration date printed on the seat itself — usually on a label on the back or bottom. Most infant car seats expire 6 to 10 years after the manufacturing date. Do not use an expired seat, even if it looks new.
Ask the previous owner whether the seat has ever been in a crash, even a minor one. A seat that has been in any collision — even at low speed — may have internal damage that is not visible and should not be used. If you cannot confirm the seat's history, it is safer to buy a new one.
Check that all parts are present: the base (if it came with one), the harness straps, the chest clip, and the instruction manual. If pieces are missing, contact the manufacturer to order replacements before you install the seat. Do not improvise with parts from other seats or with household items.
Preparing for the hospital discharge process
Once your seat is installed, keep the instruction manual in your vehicle or at home where you can find it quickly. Write down the model number and the installation method you used (LATCH or seat belt) so you can answer questions if a technician checks it later.
If you are having your baby at a hospital you have not visited before, call ahead during your third trimester and ask whether they check car seats before discharge and whether they have a preferred installation method. Some hospitals prefer LATCH installation; others prefer seat belt installation. Knowing this in advance means you can practice the method they recommend.
Pack your car seat instruction manual in your hospital bag or leave it in your vehicle. Hospital staff may ask to see it during the discharge process, and you will want it on hand if you have questions about how to use the seat once you are home.
Frequently Asked Questions
Can I install my car seat before I buy it?
No — you need the actual seat to practice installation. However, you can watch installation videos for the specific model you plan to buy, read the instruction manual online, and familiarize yourself with LATCH anchors or seat belt routing in your vehicle before the seat arrives. This preparation makes the actual installation faster.
What if my vehicle does not have LATCH anchors?
Older vehicles (before 2002) do not have LATCH anchors, but they have seat belts, which work just as well. Infant car seats can be installed with either LATCH or a vehicle seat belt — the instruction manual will show both methods. Seat belt installation is often simpler and does not require special anchors.
Do I need to install the base separately from the carrier?
Most infant car seat systems have a separate base that stays in the vehicle and a carrier that clicks into the base. You install the base during your third trimester, then click the carrier in and out as needed. Some seats are all-in-one and do not have a removable carrier — check your specific model's manual.
What if I go into labor before I install the seat?
Call ahead to the hospital and let them know you do not have a car seat yet. Many hospitals have loaner seats or can direct you to a local program that provides seats. You will not be able to leave the hospital without one, so addressing this before labor gives you more options than trying to solve it during discharge.
Can I install the car seat myself, or do I need a technician?
You can install it yourself by following the instruction manual carefully. However, having a certified technician check your work catches mistakes that are straightforward to miss — studies show that most car seats are installed incorrectly in at least one way. A check-up is worth the time, whether you do it before or after your baby is born.