Twin Gear: What to Buy Used and What to Buy New

Twin parents save more money on used gear than singleton parents because the unit cost of "two of everything new" is brutal. But used gear has a short list where used isn't acceptable, and a longer list where used is genuinely fine. Here's the line, drawn carefully.

The new-only list

Three categories, full stop:

• Car seats without a verified accident-free history. A car seat that's been in a crash, even a minor one, is structurally compromised and you can't see it. Unless you personally know the seller, buy new.
• Crib mattresses. Used crib mattresses correlate with elevated SIDS risk in epidemiological studies. The mechanism isn't fully understood; the data is enough to skip used.
• Breast pump parts that contact milk (flanges, valves, membranes, tubing on closed-system pumps). The pump motor itself is sometimes fine used; the parts that touch milk are not.

The fine-used-with-a-check list

These are safe used as long as they aren't recalled and pass a basic inspection.

• Bassinets and cribs. Check for a current safety standard (in the US: post-2011 drop-side ban; in the UK and EU: BS EN 716 compliance). Skip anything older than 10 years.
• Strollers. Check the brake, the harness webbing, and the fold latch. Wheel wear is fine; structural issues aren't.
• Bouncers, swings, play yards, walkers. Recall check, then visual check.
• High chairs. Plastic ones can crack under the seat; check the joints and harness.
• Baby monitors. Wifi monitors get firmware updated; older ones may not. Check the brand still supports its app.
• Carriers and wraps. Inspect buckles and stitching. Wash before use.
• Pump motors (closed-system pumps only). Open-system pumps can have moisture in the motor; closed-system pumps don't.

The free-on-the-curb list

These are basically risk-free used. Buy with confidence.

• Clothing. Wash on warm. Skip stained items only because they look bad, not because they're unsafe.
• Books, toys, blankets, swaddles, sleep sacks.
• Bottle warmers, sterilizers, dish racks, drying mats.
• Diaper bags. They're bags.
• Nursing pillows (cover-washable).
• Changing pads (with new cover).
• Furniture (dressers, gliders, bookshelves). The dresser becomes the changing surface; you don't need a "changing table".

Where to actually buy used

In rough order of best return per hour:

• Local twin parent groups. Facebook MOMs/MOTwins clubs, hospital twin clubs, NICU graduate groups. Other twin parents are off-loading in batches.
• Local buy-nothing or buy-something groups.
• Facebook Marketplace and Craigslist. Filter by neighborhood; ask for additional photos before driving.
• Consignment shops and resale events. Curated, slightly pricier than direct sale.
• Family hand-me-downs. Free, often the best fit, sometimes guilt-laden if you don't use it.

How to inspect a used car seat in 5 minutes

If you do go used on a car seat (only with a verified-history seller you trust):

• Check the manufacture date label. Most car seats expire 6 to 10 years from manufacture.
• Check the model and serial number against the manufacturer's recall page.
• Check the harness webbing for fading, fraying, or chemical staining.
• Check the shell for cracks, especially around the harness slots.
• Check the buckle: it should latch with an audible click and release cleanly.
• If you can't find the manual, download it from the manufacturer site.

What we'd do

New on car seats and crib mattresses. Used on basically everything else, with a 5-minute inspection. The savings on a used twin stroller alone (often $200 to $400) pays for new car seats. That's the trade most twin parents should make.

Related reading

• Twin baby registry checklist
• A twin registry on a $1,500 budget
• The real cost of twins in the first year