What diapers are safe? Here’s Our Verdict

Coterie The Diaper

Clean$$$

Last reviewed September 16, 2026

Quick verdict

Detailed composition and reported testing provide useful starting points for this review.

Check the package version: the research does not yet confirm an exact match to every current product. See version details.

Full current size/SKU-specific formulation extraction is not yet complete. See the full research below.

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Good / Caution / Avoid

Good: Current manufacturer publishes unusually detailed composition information.
EWG record located for current-size product.
Both organic-fluorine screening and a separate targeted PFAS test have been reported.
Caution: The research record does not yet capture every disclosed component.
Full numerical results and test limits remain incomplete.

Read the original editorial assessment

Verdict: Clean. Current package matching remains unresolved; read the newer evidence below.

Became EWG Verified on June 2, 2026; also OEKO-TEX Standard 100 certified and independently lab-tested in Germany. TCF wood-pulp core, roughly 25% plant-based materials, no fragrance, lotion, latex, parabens, or phthalates disclosed; the manufacturer's own materials list does disclose pigments/inks used for printed markings (not a skin-contact layer), so we no longer describe it as dye-free. Tested non-detect for organic fluorine (a PFAS marker) in initial independent testing, and non-detect across 40 specific, targeted PFAS compounds screened down to parts-per-trillion in a 2024 follow-up. Highest absorbency and overnight leak protection of the products on this page in the testing we reviewed. Acquired by Mammoth Brands in October 2025 — worth rechecking this entry if the formulation changes.

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Materials & ingredients

Factors flagged in the editorial review. Expand the research below for full formulation records, functions and sources.

No ingredient on this product's own label was specifically flagged in our review. See ingredient concerns for diapers as a whole for what we check for in this category.

What's disclosed in our research

Materials disclosed by the manufacturer or a retailer, as captured in our research — not the same as the flagged-concerns table above, and not asserted here as a complete or currently-verified ingredient list unless noted. See the full research below for sources and limitations.

Component	Material	Touches skin?	Function
Topsheet	99% polypropylene; 1% sodium dioctyl sulfosuccinate	Yes	Skin-contact topsheet / wetting
Transfer layer	100% PET (polyester)	No	Fluid transfer/acquisition
Absorbent core	45% TCF cellulose; 55% SAP/water/silicon dioxide mixture	No	Absorbency
Adhesives	Three disclosed adhesive-polymer systems; exact full extraction pending	No	Assembly/bonding
Wetness indicator	Disclosed multi-ingredient indicator mixture; exact full extraction pending	No	Color-change wetness indication
Pigments/inks	Identified pigments disclosed by manufacturer; exact full extraction pending	No	Printing / visual markings

Testing history

Source	Date	Tested for	Result
Independent lab testing (Germany)	—	Organic fluorine (a PFAS marker) and general safety screening	Non-detect for organic fluorine in initial testing
Independent lab testing (follow-up)	2024	40 specific PFAS compounds, screened down to parts-per-trillion	Non-detect

Certifications held

Certification	What it actually verifies
EWG Verified	Screens the finished product against EWG's list of chemicals of concern.
OEKO-TEX Standard 100	Tests textiles against a defined list of harmful substances; does not guarantee PFAS-free, since its test method can miss certain fluoropolymers.

Recalls, litigation & complaint history

Case / event	Status
Saedi et al. v. Coterie Baby, Inc., No. 1:24-cv-03893 (S.D.N.Y.)	A PFAS class action concerning Coterie's diapers, dismissed in October 2024 for failing to plausibly allege the specific product purchased actually contained PFAS — a standing/pleading ruling, not a finding on the merits.

Explore the research

Research record last verified: 2026-09-16.

This evidence file is still being deepened with citations and package-version detail — the published verdict above already reflects everything gathered so far, and doesn't change as that detail is filled in.

What you should know

The current partial record does not yet transcribe every percentage/component from the manufacturer full-materials page.
Manufacturer-described contaminant testing still needs underlying numerical laboratory results where obtainable.

What's still uncertain

Exact lot/batch and full analyte-by-analyte limits for the reported PFAS testing remain to be captured.

Exact product identity

Technical detail — Exact product identity

Canonical Product Name: Coterie The Diaper
Category: Diapers
Region: United States
Brand: Coterie
Market Status: current
Exact Variant: The Diaper; size-specific SKUs
Package Generation: Current 2026 formulation/material disclosure
Aliases: No entries recorded
Sizes: No entries recorded

Formulations, ingredients & materials

Technical detail — Formulations, ingredients & materials

Formulation Id
COTERIE-2026-MFR
Status
probably_current
Region
United States
Variant
The Diaper
Size Scope
Manufacturer disclosure includes size-specific examples; Size 4 percentages captured here where explicitly reported
Observed From
2026-06-02
Package Generation
Current manufacturer full-materials disclosure
Materials
- Component
  Topsheet
  Material
  99% polypropylene; 1% sodium dioctyl sulfosuccinate
  Function
  Skin-contact topsheet / wetting
  Skin Contact
  Yes
  Source Ids
  Coterie (COT-S1)
- Component
  Transfer layer
  Material
  100% PET (polyester)
  Function
  Fluid transfer/acquisition
  Skin Contact
  No
  Source Ids
  Coterie (COT-S1)
- Component
  Absorbent core
  Material
  45% TCF cellulose; 55% SAP/water/silicon dioxide mixture
  Function
  Absorbency
  Skin Contact
  No
  Source Ids
  Coterie (COT-S1)
- Component
  Adhesives
  Material
  Three disclosed adhesive-polymer systems; exact full extraction pending
  Function
  Assembly/bonding
  Skin Contact
  No
  Source Ids
  Coterie (COT-S1)
- Component
  Wetness indicator
  Material
  Disclosed multi-ingredient indicator mixture; exact full extraction pending
  Function
  Color-change wetness indication
  Skin Contact
  No
  Source Ids
  Coterie (COT-S1)
- Component
  Pigments/inks
  Material
  Identified pigments disclosed by manufacturer; exact full extraction pending
  Function
  Printing / visual markings
  Skin Contact
  No
  Source Ids
  Coterie (COT-S1)
Source Ids
- Coterie (COT-S1)

Testing: methods, samples & results

Published screening reported non-detect organic fluorine for Coterie diaper portions; this is not equivalent to proving absence of every individual PFAS compound. (2 tests recorded — see the technical detail below for every result.)

Technical detail

Test Category
organic_fluorine_screen
Interpretation
Published screening reported non-detect organic fluorine for Coterie diaper portions; this is not equivalent to proving absence of every individual PFAS compound.
Exact Product
Coterie diaper
Test Id
COTERIE-MAMAVATION-ORGANIC-FLUORINE
Organization
Mamavation
Laboratory
EPA-certified laboratory; exact lab not captured in current partial record
Method
Organic-fluorine screening as described in Mamavation diaper investigation
Analytes
- Analyte
  Organic fluorine - inside
  Result
  Non-detect
  Unit
  ppm
  Reporting Limit
  Study screening threshold; verify exact sample-level reporting line
  Detection Status
  not_detected_above_reporting_capability
- Analyte
  Organic fluorine - outside
  Result
  Non-detect
  Unit
  ppm
  Reporting Limit
  Study screening threshold; verify exact sample-level reporting line
  Detection Status
  not_detected_above_reporting_capability
Limitations
- Exact SKU/lot details should be captured from the underlying report if available.
Source Ids
- Mamavation (COT-S4)
Test Category
specific_PFAS
Interpretation
Targeted PFAS testing is analytically distinct from total/organic-fluorine screening and is preserved separately.
Exact Product
Coterie Size 1 diaper
Test Id
COTERIE-2024-TARGETED-PFAS
Organization
Mamavation
Laboratory
Not captured in current partial record
Test Date
2024
Method
Targeted analysis for 40 PFAS analytes; public summary states ppt-level sensitivity
Analytes
- Analyte
  40 targeted PFAS analytes
  Result
  All reported non-detect
  Unit
  ppt
  Reporting Limit
  Analyte-specific limits not yet transcribed
  Detection Status
  not_detected_above_reporting_capability
Limitations
- Full laboratory report, method identifiers, individual analytes and individual reporting limits still need transcription.
Source Ids
- Mamavation (COT-S4)

Certifications: scope & limitations

Certifications reviewed: EWG Verified, OEKO-TEX testing/certification context. Does not by itself establish absence of every unintended contaminant in every production lot. Underlying numerical results have not yet been fully transcribed into this record.

Technical detail

Certification
EWG Verified
Status
current_record_located
Certifying Body
Environmental Working Group
Date Verified
2026-09-16
Product Scope
Coterie The Diaper; Size 3 record reviewed
Does Not Establish
- Does not by itself establish absence of every unintended contaminant in every production lot.
Source Ids
- Environmental Working Group (COT-S2)
Certification
OEKO-TEX testing/certification context
Status
manufacturer_reported_safety_report
Certifying Body
OEKO-TEX
Date Verified
2026-09-16
Product Scope
Current Coterie diaper safety-report program
Does Not Establish
- Underlying numerical results have not yet been fully transcribed into this record.
Source Ids
- Coterie (COT-S3)

Manufacturer claims

Technical detail — Manufacturer claims

Claim
Coterie reports independent OEKO-TEX laboratory testing across 13 heavy metals, 120+ pesticides, 20+ phthalates, bisphenols, VOCs, PFAS and other substances, with certification granted in March 2025.
Verification Status
manufacturer_reported; full numerical lab report transcription pending
Source Ids
- Coterie (COT-S3)

Legal history: allegations & outcomes

Technical detail — Legal history: allegations & outcomes

Case Name: Saedi v. Coterie Baby, Inc.
Docket: 1:24-cv-03893
Court: U.S. District Court for the Southern District of New York
Filed Date: 2024
Event Type: dismissal
Current Status: First amended complaint dismissed without prejudice on 2024-10-03 for lack of Article III standing.
Exact Product Scope: Coterie diapers
Allegations: Plaintiff alleged Coterie diapers contained PFAS despite PFAS-free / harmful-chemical-free marketing.
Findings: Court did not find that Coterie diapers contained PFAS.
Court did not find that Coterie diapers were PFAS-free.
Dismissal was based on standing and failure to plausibly connect the tested/general contamination allegations to diapers purchased by the plaintiff.
Source Ids: U.S. District Court for the Southern District of New York / Justia mirror (COT-LEGAL-1)

Evidence assessment & uncertainty

Technical detail — Evidence assessment & uncertainty

Positive Attributes: Current manufacturer publishes unusually detailed composition information.
EWG record located for current-size product.
Both organic-fluorine screening and a separate targeted PFAS test have been reported.
Important Concerns: The current partial record does not yet transcribe every percentage/component from the manufacturer full-materials page.
Manufacturer-described contaminant testing still needs underlying numerical laboratory results where obtainable.
Uncertainties: Exact lot/batch and full analyte-by-analyte limits for the reported PFAS testing remain to be captured.
Unverified Claims: No entries recorded

Formulation verification

The current package still needs to be matched to this evidence because: Full current size/SKU-specific formulation extraction is not yet complete.

Technical detail

Formulation Verification Required: Yes
Reasons: Full current size/SKU-specific formulation extraction is not yet complete.
Package Evidence Needed: Current package materials panel, UPC/GTIN, lot code and certification markings.

Sources & provenance (5)

Source Id
COT-S1
Title
Full Materials List
URL
https://www.coterie.com/blog/full-materials-list
Source Type
manufacturer
Organization
Coterie
Publication Date
2026-06-02
Update Date
Not recorded
Access Date
2026-09-16
Primary Source
Yes
Exact Product Match
exact
What It Establishes
Current June 2026 composition disclosure including material percentages and component functions.
Limitations
Not recorded
Source Id
COT-S2
Title
Coterie The Diaper, Size 3
URL
https://www.ewg.org/skindeep/products/4418187-Coterie_The_Diaper_Size_3/
Source Type
certification_database
Organization
Environmental Working Group
Publication Date
Not recorded
Update Date
2026-06
Access Date
2026-09-16
Primary Source
Yes
Exact Product Match
exact
What It Establishes
Current EWG product record; data updated June 2026.
Limitations
Not recorded
Source Id
COT-S3
Title
Safety Reports
URL
https://www.coterie.com/safety-reports
Source Type
manufacturer
Organization
Coterie
Publication Date
Not recorded
Update Date
Not recorded
Access Date
2026-09-16
Primary Source
Yes
Exact Product Match
exact
What It Establishes
Manufacturer summary of third-party/OEKO-TEX laboratory testing categories and certification timing.
Limitations
Not recorded
Source Id
COT-S4
Title
Disposable Diapers & PFAS / fluorine testing investigation
URL
https://mamavation.com/motherhood/diapers-pfas-forever-chemicals.html
Source Type
independent_testing_report
Organization
Mamavation
Publication Date
Not recorded
Update Date
Not recorded
Access Date
2026-09-16
Primary Source
No
Exact Product Match
probable
What It Establishes
Reports Coterie organic-fluorine screening and a separate 2024 targeted 40-PFAS Size 1 test.
Limitations
Public article summary; full laboratory documentation should be captured where available.
Source Id
COT-LEGAL-1
Title
Saedi v. Coterie Baby, Inc., Order/Opinion
URL
https://law.justia.com/cases/federal/district-courts/new-york/nysdce/1%3A2024cv03893/621822/22/
Source Type
court_record
Organization
U.S. District Court for the Southern District of New York / Justia mirror
Publication Date
2024-10-03
Update Date
Not recorded
Access Date
2026-09-16
Primary Source
Yes
Exact Product Match
exact
What It Establishes
Dismissal without prejudice for lack of Article III standing and the court's procedural reasoning.
Limitations
Dismissal on standing did not resolve the merits of PFAS allegations.

Ingredient & material research library · How we assess evidence

Read the category’s editorial sources

Final verdict against our diapers standard

This is the published editorial verdict. Read the formulation caveats and working research above; the imported evidence has not automatically re-scored this product.

Clean Published as Clean under the published standard for diapers, based on the specific, dated findings above. That standard was written before this or any other product on the page was evaluated, and doesn't change to fit a favorite — see the full site-wide standard for how every category is held to the same process.

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