Read a diaper materials list one part at a time. Start with what touches your baby's skin, then check the absorbent core, outer layer, cuffs, tabs and other components. When a package makes a testing or environmental claim, ask which part was tested and what the result actually covers.
A diaper is an assembled product. One material name on the front of the pack cannot tell you everything about the finished diaper. A complete list names every component, gives its material and, at its best, tells you how much of the diaper each component is by weight.
1. Find the material against the skin
The top sheet faces your baby. Look for a named material, and check whether the description applies to that layer specifically. Words about softness or feel describe an experience. A materials list should also tell you what the layer is made from.
Then look at the leg cuffs, the ears and any other parts that can touch the skin. “Cotton top sheet” and “cotton on every layer that touches baby” describe different scopes. Read the full explanation rather than assuming the claims mean the same thing.
2. Read the absorbent-core description
The core takes in and holds liquid. A materials description should explain its components separately from the skin-facing layer. Most cores have two parts: fluff pulp, which draws liquid in and spreads it, and a superabsorbent polymer, which holds it. If the maker uses the abbreviation SAP, ask what it means and what the polymer is made from.
SAP stands for Super Absorbent Polymer. The dry material is tiny beads; when wet, the beads swell into a gel. Calling the top sheet cotton does not explain the composition of this separate part.
3. Include the smaller parts
Look for information about the barrier film, outer cover, leg cuffs, waistband, ears, tabs, elastics, adhesives and any wetness indicator. These parts can be easy to miss in a short product description, and several of them touch the skin.
An unanswered question is an unanswered question. It is not proof that a material is harmful, and it is not proof that it is absent. If the list does not give you the information you need, ask the maker for the component description.
4. Check the scope of a test or certificate
Useful supporting information tells you what was tested, by whom, when, and with which method. It should explain the conditions and limits of the result. A test on a fiber is different from a test on the finished diaper.
The same distinction applies to biodegradability. Evidence about a named component under specific test conditions does not establish what will happen to the whole used diaper in a landfill or home compost bin.
A layer-by-layer checklist you can save
A disposable diaper is built in layers, from the top sheet down to the glue that holds it together. The table follows that order. The last two columns work on any brand: a good answer names the material for that part; a better answer also gives the part's share of the diaper by weight, so you can see how much of the product each material really is.
| Part | What it does | Question to ask | A good answer names the material | A better answer gives its share of the diaper by weight |
|---|---|---|---|---|
| Top sheet | The layer against the skin; lets liquid through to the core | What is this layer made from? | fiber or film: cotton, polypropylene, polyester, PLA. | its own percentage of the diaper |
| Acquisition layer | Sits under the top sheet; pulls liquid away from the skin and spreads it | What is under the top sheet? | A named nonwoven or apertured film, and what it is made from | Listed separately from the top sheet |
| Fluff pulp | The fibrous part of the core; takes liquid in and moves it | What pulp is used, and how is it bleached? | The fiber (wood pulp or another named fiber) and the bleaching process: TCF, ECF or unbleached | The pulp's share, separate from the polymer |
| Superabsorbent polymer | The beads in the core; hold liquid as a gel | Which polymer, and what is it made from? | The polymer named (for example sodium polyacrylate) and its source material | The polymer's share, separate from the pulp |
| Core wrap | Tissue or nonwoven that keeps the pulp and beads in place | What wraps the core? | A named tissue, nonwoven or film | Its own percentage |
| Leg cuffs | Stand up around the thighs to hold in leaks; they touch skin | What are the cuffs made from, and do they touch the skin? | a named fiber, stated separately from the top sheet | Its own percentage, so you can see how much skin-contact material is in the cuffs |
| Waistband | The stretch strip at the waist | What is the waistband made from? | A named nonwoven or stretch material | Its own percentage |
| Elastics | Thin strands in the cuffs and waist that give the stretch | What are the elastic strands made from? | A named stretch material (for example spandex or rubber) | A figure, not a phrase like “a small amount” |
| Barrier film | Between the core and the outer cover; keeps liquid from soaking through | Is there a film between the core and the outside, and what is it? | A named film: polyethylene, a bioplastic, or another stated polymer | Listed separately from the outer cover |
| Outer cover | The outside of the diaper, the part you and the clothes touch | What is the outside layer made from? | A named fiber or film | Its own percentage, separate from the barrier film |
| Wetness indicator | The stripe that changes color when the diaper is wet | What is the indicator, and where does it sit? | The type (for example a pH-sensitive adhesive or an ink) and its position in the diaper | Whether it is counted inside the adhesive figure or on its own |
| Ears | The side panels that stretch around the hips; they touch skin | What are the ears made from? | A named nonwoven or stretch laminate | Its own percentage |
| Tab and hook | The fastener on each ear that grips the front of the diaper | What are the tab and the hook made from? | A material for the tab and one for the hook; they can differ | Its own percentage |
| Landing zone | The strip on the front that the hooks grip | What is the landing zone made from? | A named loop material | Its own percentage |
| Adhesives | Glue that holds the layers together | What adhesive is used, and where? | The adhesive type (for example hot-melt) and the number of glue points | A figure, so “trace” becomes a number |
If a brand gives every row a material and a share by weight, the shares should add up to the whole diaper. If several rows are blank, treat the list as partial and ask for the rest.
Three terms that get mixed up
TCF and ECF. Both describe how fluff pulp was bleached. ECF, elemental chlorine-free, means no chlorine gas was used, but chlorine compounds such as chlorine dioxide were. TCF, totally chlorine-free, means no chlorine compounds at all; oxygen, ozone or hydrogen peroxide do the bleaching instead. Both are bleaching processes. “Chlorine-free” on its own does not tell you which one, so ask for the letters.
“Cotton top sheet” and cotton on every skin-contact layer. A cotton top sheet is one layer. The leg cuffs, the ears and the outer cover can also touch the skin, and each can be a different material. If a pack says cotton, ask which layers, and whether the cuffs and ears are included.
“Plant-based.” This describes where a material started, not what it is or where it sits. Ask which polymer and which layer. PLA is a polymer made from plant starch and is used in films and nonwovens. Sodium polyacrylate, the usual superabsorbent polymer, is made from acrylic acid, which is derived from petroleum. A diaper can have a plant-based top sheet and a petroleum-based polymer in the core at the same time.
How to read Change's description
Change's short description is “only 100% cotton touching your baby, and the world's first and only biodegradable Super Absorbent inside.” Those two statements identify different parts of the product: the cotton is the top sheet, leg cuffs, ears and outer cover; the Super Absorbent is in the core. They should be read alongside the complete construction information, not as a claim that every part of the diaper is cotton.
Change also publishes every component of the diaper with its share of the diaper by weight, top sheet to adhesives, on the materials page. Use it the same way you would use the checklist above: find the part, read the material, check the share. For sizes and purchase options, visit the Change diaper page; for fit and care questions, read the FAQ. If you need a component detail you cannot find, send us the question.