Safety 1st onBoard 35 LT Base expiration date
Safety 1st says the onBoard 35 LT Base expires 8 years after its date of manufacture. A seat made in May 2024 can be used until May 2032.
"Do not use this base more than 8 years after the date of manufacture."
From Safety 1st's onBoard 35 LT Base manual, checked 2026-11-07.
When does my onBoard 35 LT Base expire?
Enter the date of manufacture from the label on your seat. It is not the date you bought it.
Key takeaways
- Safety 1st onBoard 35 LT Base: 8 years from the date of manufacture.
- Type: infant seat base.
- Count from the date on the label, not the purchase date.
- If the label prints an expiration date, that date wins.
Where to find the date on the onBoard 35 LT Base
Look for a white sticker on the plastic shell, usually on the back, the side or underneath. It lists the model number and the date of manufacture, and newer seats often print the expiration date on the same label or stamp it into the plastic.
Replacing an expired onBoard 35 LT Base
Buy new rather than used: a used seat's crash history and real age are hard to know.
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When to replace a seat before it expires
- After a moderate or severe crash. NHTSA lists the conditions under which a seat can stay in use after a minor one: car seat use after a crash.
- When the label with the date of manufacture is missing and the maker cannot tell you the date from the serial number.
- When the seat has a recall that has not been fixed. Register the seat with its maker so recall notices reach you.
- When your child is past the seat's height or weight limit, whatever the date.
Before you throw an expired seat out, cut the harness straps and write EXPIRED on the shell so nobody picks it up and uses it.
All Safety 1st seats
Safety 1st car seat expiration for all 23 models
Every lifespan on this page is quoted from the seat maker's own product page, manual or expiration guide, and the quote was checked against that page on the date shown. If the label on your seat prints an expiration date, that date wins.