Natural DiapersToxin-FreeBaby Safety

PFAS, Chlorine, Dioxins & Fragrances: The Hidden Chemicals in Conventional Diapers

By Dr. Sharon Fried Buchalter, Ph.D.July 2026 

PFAS, Chlorine & Dioxins: What's Hidden in Conventional Diapers

Dr. Sharon Fried Buchalter, Ph.D. · Little Toes®

The diaper is perhaps the most intimate product in a baby's daily life. It is against their skin for nearly 24 hours a day. It sits directly against the genitalia — tissue with some of the highest dermal absorption rates in the body. And yet, until very recently, conventional diaper manufacturers were not required to disclose their ingredients, and parents had almost no way of knowing what chemicals their babies were exposed to with every change.

That is changing. Investigative journalism, independent laboratory testing, emerging regulatory pressure in Europe and several U.S. states, and the growing natural baby products market have forced greater transparency. What that transparency has revealed warrants the attention of every parent who has ever wondered what is actually in a conventional diaper.

"A baby goes through approximately 7,000 diaper changes in their first three years of life. The cumulative dermal exposure to whatever chemicals touch that skin is not trivial. It deserves honest scrutiny."

— Dr. Sharon Fried Buchalter, Ph.D.

The Chemicals of Concern: A Scientific Overview

PFAS: Per- and Polyfluoroalkyl Substances

PFAS — a group of over 12,000 synthetic fluorinated compounds — are sometimes used in diaper manufacturing for their water and oil repellency properties, particularly in the outer backsheet layer. They are often called "forever chemicals" because they are extraordinarily resistant to environmental and biological degradation. PFAS accumulate in the body over time (bioaccumulation) and have been associated in peer-reviewed research with immune system disruption, thyroid hormone disruption, developmental toxicity, and increased cancer risk.

In 2023, a peer-reviewed study published in Environmental Science & Technology tested 23 disposable diaper brands sold in the U.S. and Europe and found PFAS in a significant proportion of the tested products, including in the inner layers that contact infant skin. The specific PFAS compounds detected included PFOA and PFOS — two of the most studied and regulated PFAS compounds — as well as numerous shorter-chain PFAS that are less regulated but share similar bioaccumulation and endocrine-disruption profiles.

What to look for: diapers certified by Oeko-Tex Standard 100 (which tests for PFAS as of its updated standards) or brands that explicitly certify PFAS-free formulation. At Little Toes®, our diapers are formulated without PFAS and certified under Oeko-Tex Standard 100, which provides third-party verification of this claim.

Dioxins and Furans: Chlorine Bleaching Byproducts

The wood pulp used in the absorbent core of most disposable diapers (and many cloth diapers) was historically bleached with elemental chlorine — a process that produces dioxins and furans as chemical byproducts. Dioxins are among the most toxic persistent organic pollutants known to science. They accumulate in fatty tissue, are transmitted through breast milk, and have been associated with cancer, immune dysfunction, and endocrine disruption in animal studies at extremely low doses.

Modern "chlorine-free" manufacturing uses either ECF (Elemental Chlorine Free, which uses chlorine dioxide — producing dramatically less dioxin) or TCF (Totally Chlorine Free, using oxygen or peroxide bleaching — producing no dioxins). Look for "chlorine-free," "TCF," or "ECF" on diaper packaging. Note that TCF is meaningfully cleaner than ECF; both are significantly better than conventional chlorine bleaching. Little Toes® uses a TCF bleaching process.

Synthetic Fragrances

The word "fragrance" on a baby product label is a legal smokescreen. Under U.S. law, the specific chemical components of a "fragrance" are considered trade secrets and do not need to be disclosed on the label. A single fragrance formulation may contain dozens to hundreds of individual synthetic chemicals, including phthalates (endocrine disruptors), musks (potential hormone disruptors that bioaccumulate), and contact allergens.

The American Academy of Pediatrics recommends fragrance-free products for babies with sensitive skin or eczema. Multiple dermatology studies have identified fragrance as the most common cause of allergic contact dermatitis from baby wipes and diapers. There is no medical justification for fragrance in a diaper — it serves only a cosmetic purpose for the parent who opens the package. Avoid fragranced diapers entirely.

Optical Brighteners

Optical brighteners (fluorescent whitening agents) are synthetic chemicals added to make diaper materials appear whiter and brighter. They serve no functional diapering purpose. Several optical brighteners are known skin sensitizers, particularly for babies with eczema or atopic dermatitis. A white diaper that does not list optical brighteners in its certifications should be questioned.

Super Absorbent Polymer (SAP) — What We Know

Sodium polyacrylate, the super absorbent polymer in most disposable diapers, has been extensively studied and is not currently categorized as a health concern at the concentrations found in diapers. However, it is a petrochemically derived synthetic polymer, and the long-term effects of chronic low-level skin exposure over the first three years of life have not been definitively studied in human infants. This is a reasonable uncertainty to be aware of, even if it is not currently classified as a known hazard.

The Regulatory Gap: Why Diapers Are Not as Regulated as You Might Expect

In the United States, diapers are classified as "medical devices" under FDA jurisdiction for some purposes, but ingredient disclosure requirements are significantly weaker than for personal care products regulated under the FDA's cosmetic authority. There is no federal requirement to disclose all chemical components of a diaper.

Europe has moved significantly further than the U.S. on this. The European Commission's SCENIHR (Scientific Committee on Emerging and Newly Identified Health Risks) completed a comprehensive safety assessment of dioxins, furans, and dioxin-like PCBs in baby diapers. Several EU member states have implemented tighter dioxin standards than the U.S. The REACH regulation (Registration, Evaluation, Authorization and Restriction of Chemicals) provides a significantly more precautionary framework for chemical use in consumer products than current U.S. law.

Several U.S. states — California, New York, New Hampshire — are in various stages of diaper ingredient disclosure legislation. This trend will accelerate. Brands that have already voluntarily adopted the highest transparency and certification standards are ahead of the regulatory curve.

The 9 Ingredients Little Toes® Will Never Use

At Little Toes®, our commitment is absolute: we formulate without chlorine bleaching, PFAS, synthetic fragrances, parabens, phthalates, optical brighteners, latex, TBT (tributyltin), and formaldehyde releasers. This "Purity Promise" is not marketing language — it is a documented, certified formulation commitment verified by independent third-party certifiers including Oeko-Tex, Ecocert, and our dermatological endorsement from Dr. Ira Finegold, MD, Chief of Allergy at Mount Sinai West

How to Read a Natural Diaper Label: A Parent's Checklist

Does it carry Oeko-Tex Standard 100? (Tests for 100+ harmful substances)
Is it chlorine-free — and specifically TCF (Totally Chlorine Free)?
Does it explicitly state fragrance-free and no optical brighteners?
Does it carry a named, verified dermatologist endorsement (not just "dermatologist tested")?
Is the biodegradability claim specific (percentage and test standard cited)?
Does it carry OK Biobased certification confirming biologically-derived content?
Is the brand transparent about its manufacturing practices and supply chain?

— Dr. Sharon Fried Buchalter, Ph.D. · Founder, Little Toes® · a/k/a The Diaper Whisperer

Clean From the Inside Out

Little Toes® diapers carry the industry's most comprehensive safety
certification stack. No PFAS. No chlorine. No fragrance. No compromises.

S

Dr. Sharon Fried Buchalter, Ph.D.

Clinical and Industrial Psychologist, MBA, Founder of Little Toes®. The Diaper Whisperer.