Car Seat Expiration Dates Are Real. Here's What Parents Need To Know

Between sleep deprivation, feeding schedules and the endless baby-gear checklist, it’s easy to miss one important detail: car seats expire. That matters for safety and, in some cases, legality. If you’re buying a brand-new seat, its useful life will likely cover the years your child needs it. But if you’re reusing a seat for a second or third child, or thinking about buying a second-hand one, it’s important to understand how car seat expiration dates work and what makes a car seat unsafe.

Here are a few quick facts to keep in mind:

• Car seats save lives, but they have a limited “useful life” for safety reasons.
• Parents often encounter hand-me-downs and second-hand deals, and expiry dates help assess safety.
• Expiration ties to real issues: material degradation over time and evolving safety standards.
• Knowing where to find the date prevents guesswork and helps you plan replacements.

Do car seats expire? The short answer (and why it matters)

The short answer is yes, most seats do have expiry dates that are set by manufacturers. This is because materials can degrade over time, and safety standards can change. “Although not required by regulation, most, if not all, child car seats and booster seats sold in Canada have an expiry date or useful life date on them,” said Flavio Nienow, a spokesperson for Transport Canada.

Expiration dates aren’t mandated by regulation, but most seats sold in Canada include them, and parents should follow them.

Reasons an expired car seat might not be safe

Plastic shells and components can weaken over time due to heat, cold, and UV exposure.

Also, standards and designs improve, which means that older seats may not reflect current best practices. Manufacturers validate safety within a defined “useful life,” beyond which performance isn’t guaranteed.

Transport Canada recommends ensuring that any seat you’re planning to buy, borrow, or use hasn’t been recalled as well.

Why manufacturers set expiration dates

Expiration dates on car seats are not some sort of gimmick designed to “force” parents to continually have to buy newer models. There are practical, safety-based reasons behind the expiry dates.

Most car seats have a lifespan of six to 10 years from their date of manufacture, depending on the manufacturer and model. This “useful life” helps ensure the plastic, straps, and components haven’t degraded to the point that they may no longer perform as intended in a crash.

Signs of questionable wear and tear

• Material aging: plastic fatigue, micro-cracks, and weakening from temperature swings and UV.
• Worn-out components: webbing, buckles, adjusters, labels, and foam can degrade with spills and heavy use.
• Missing labels, instructions, or parts: if you can’t verify what the seat is, when it was made, or whether all pieces are intact, that’s a red flag.

Another thing to keep in mind: standards and technology evolve, and newer seats may offer improved crash performance and features.

Where is the expiration date on a car seat? How to find it fast

“To verify the date of manufacture and expiration date for your specific child car or booster seat, look for a label affixed to the seat and/or in the instruction manual,” Nienow explained. “For more information on expiry dates, it is best to contact the manufacturer of your specific child car seat or booster seat.”

Remember to differentiate between the “date of manufacture” (DOM) and “Do not use after” labels, because these can be entirely different dates.

Some seats mould the date into the plastic shell, and others list both the DOM and expiry dates. If your label only shows the date of manufacture, check the manual or contact the manufacturer.

When do different types of car seats expire?

Car seat expiry dates range by manufacturer and model. In many cases, seats last about six to 10 years from the date of manufacture, but it’s always best to check the label and manual for your specific seat.

Infant seat bases may have a different expiry date from the seat itself, so check the base label separately.

Common myths about car seat expiration (and the facts)

All too often, we shrug off things like “expiry dates” on items because we think it’s an attempt by the manufacturer to get us to keep spending money. We may also think that because a car seat looks like it’s in good condition, we can trust it to perform properly in an accident. Here are a few common myths:

• “It’s just a money grab.” → Expiration is based on material aging and validated safety windows, not marketing.
• “If it looks fine, it’s safe.” → Micro-cracks, weakened plastics, missing parts, or missing labels aren’t always obvious, but they can affect safety.
• “Boosters don’t expire.” → Most boosters have expiry dates, so check labels and manuals.
• “Only crashed seats are unsafe.” → Crash history matters, but expiration, recalls, and unknown history are separate safety concerns.
• “Expiration is required by law.” → While it may not be mandated by regulation, most seats in Canada include expiry dates.

Second-hand seats and hand-me-downs in Canada: What’s safe and what’s legal

There are a lot of purchases needed in those first few years of a baby’s life, and it can make good fiscal sense to buy things second hand. But when it comes to a car seat, it’s important to check several things on a must-have list to ensure it’s safe as well as legal.

• Look for the National Safety Mark, which shows the seat meets Canadian safety standards.
• Verify that all parts are present and undamaged, and that the labels and instruction manual are available.
• Confirm there have been no recalls with the manufacturer or Transport Canada.
• Do not use a seat that has been in a collision.
• The safest used seat is one from a trusted source with full history and documentation. Otherwise, skip it.

Replace sooner than the expiry date? Situations that end a seat’s life early

In some cases, a car seat may need to be replaced before that date. If the seat has been involved in a collision, it may not be safe to use. Cracks, stressed plastic, frayed harnesses, stuck buckles, missing parts, altered components, or an unknown history may also mean it’s time to retire the car seat early.

Also, if the car seat was stored in extreme heat or cold, or in prolonged sun exposure, those factors can accelerate wear.

What to do with an expired car seat

Some municipalities and manufacturers offer car seat recycling or take-back options, so check local programs first.

If recycling isn’t available, cut the harnesses, remove the covers or foam if required by local rules, mark the seat “Expired/Do Not Use,” and dispose of it according to local waste guidelines.

Do not donate or resell expired seats, because it’s unsafe and may be illegal in some cases.

Quick answers to top parent questions about expiration dates

Do infant car seats expire? Yes. Infant seats have expiry dates or useful-life dates too.

When do car seats expire? Most expire about six to 10 years from the date of manufacture, but check your label and manual.

Where is the expiration date on a car seat? Look for a sticker on the back, side, underside of the seat or base, or moulded into the plastic. You can also check the manual.

Where do you find the expiration date on car seat bases? Often on the underside of the base or near the level indicator. It may differ from the seat itself.

What if my label only shows a manufacture date? Your manual may list the useful life, or you can contact the manufacturer with your model number.

Canadian standards and staying up to date

Don’t leave anything to question: check Transport Canada, follow the manufacturer’s instructions, and always ensure your seat has the National Safety Mark. Take note of your seat’s model and brand, and follow them for recall and safety updates.

Replacing your car seat on time means your child benefits from improved safety standards and the seat’s intended safety performance.