Between TikTok and Reddit, toxin-free parenting content has a lot of parents wondering whether something as basic as a crib sheet could be hiding PFAS or microplastics. The honest answer is yes, both can show up in bedding, but almost always tied to a specific treatment or fiber type, not to bedding in general. Here is what each one actually is, where it tends to hide, and what to ask before you buy.

This matters more for babies than it does for adults. Infant skin is thinner and more permeable than adult skin, and a baby spends far more hours a day in direct contact with a crib sheet than an adult does with any single textile. That is not a reason for alarm, but it is a reasonable reason to ask a few specific questions before you buy, rather than trusting a vague label.

What Are PFAS, and Where Do They Actually Show Up in Bedding?

PFAS, or per- and polyfluoroalkyl substances, are a group of synthetic chemicals used since the 1950s to make textiles resistant to water, oil, and stains. They are sometimes called ‘forever chemicals’ because they break down very slowly in the environment and in the body.

Independent testing has found a clear pattern here. PFAS shows up almost exclusively in bedding marketed as stain-resistant, water-resistant, or wrinkle-free, things like performance sheets and treated mattress pads. Plain cotton sheets carrying no such claims had a very low likelihood of containing PFAS at all. In other words, this is not a risk spread evenly across all bedding; it is concentrated in items sold specifically for their resistance to stains or wrinkles.

What Are Microplastics, and Do Cotton Sheets Shed Them?

Microplastics are tiny plastic fragments that shed from synthetic materials over time. In bedding, the main sources are synthetic fiber, polyester, nylon, and acrylic, which release plastic microfibers with every wash and even through everyday friction during sleep. Natural fibers work differently. Cotton does shed fiber too, but it is a natural, biodegradable fiber, not a plastic one. For more on how fiber choice affects a sheet beyond this specific question, our jersey cotton crib sheets guide covers the fabric itself in more depth.

Why Do PFAS and Microplastics Show Up in Baby Bedding?

Here’s a quick summary of where these chemicals come from:

Does a Certification Like OEKO-TEX Actually Test for This?

Partially. OEKO-TEX Standard 100 Class 1 tests the finished fabric for more than 1000 substances, and PFAS is specifically among them, so a Class 1 certified sheet has been independently checked for PFAS residue. Our OEKO-TEX certified baby sheets guide breaks down the full list of what Class 1 screens for.

It is worth being precise about what the certification does not cover, though. OEKO-TEX tests for chemical residues in the finished product; it does not run a separate test for microplastic shedding as a separate category. That side of the equation comes down to fiber type instead, which is why the fabric itself, not just the certificate, needs to be considered as well.

What Should You Ask a Brand Before You Buy?

A few direct questions cut through vague marketing language faster than any logo can.

None of these questions require special expertise to ask, and a brand that has actually done the testing should be able to answer all four without hesitation.

The Simplest Way to Avoid Both Is the Fabric Itself

Plain, untreated, 100% jersey cotton sidesteps both concerns by design. There is no synthetic fiber to shed as microplastic, and no stain- or wrinkle-resistant finish that would typically carry PFAS in the first place. Independent OEKO-TEX Class 1 testing then confirms this.

Joey + Joan sheets are 100% jersey cotton with no stain- or water-resistant treatment, and are OEKO-TEX Standard 100 Class 1 certified. You can browse the collection here.

Frequently Asked Questions

Do organic labels guarantee a sheet is PFAS-free?

Not on their own. An organic label speaks to how the fiber was grown, so pair it with an OEKO-TEX certificate if PFAS testing specifically matters to you.

Are waterproof crib sheet protectors more likely to contain PFAS?

Yes, waterproof and stain-resistant products are the category most frequently found to contain PFAS in independent testing.

Can washing remove PFAS from a treated sheet?

Not reliably. PFAS finishes are designed to withstand repeated washing, which is part of why they persist in fabric over time.

Is "microplastic-free" a certified claim?

No. Unlike OEKO-TEX or GOTS, there is no standardized, independently verified certification specifically for microplastic shedding at this time.

Does an all-cotton sheet mean the whole bed seup is microplastic-free?

Not necessarily. Other items in the sleep space, like a synthetic mattress pad or waterproof protector, can still shed microplastics even if the sheet itself is cotton.

Sources

1. Many Eco-Friendly Children's Textiles Found to Contain Toxic PFAS Chemicals - A Silent Spring Institute study on which types of textiles with eco-friendly labels contain PFAS chemicals. 
2. Quantifying Shedding of Synthetic Fibers from Textiles - A study by the National Institutes of Health on which fibers shed microplastics and how serious this shedding is.