Quick answer
Yes — give new kids' clothes one wash before first wear. Even garments made to strict EU limits can carry loose dye, finishing agents and dust from handling, and a single warm wash with a plain, fragrance-free detergent clears most of it. It matters most for babies, for anything worn against the skin, and for children with eczema or sensitive skin.
It is one of the small questions that comes up the moment a parcel lands on the mat: the sleepsuit looks clean, it smells of nothing much, and there is a very tired parent holding it. Does it really need a wash first?
Short version — yes, and it takes one cycle. Here is what is actually on a new garment, what the law already keeps out of it, and how to prewash without shrinking anything you have just paid for.
What's actually on a brand-new garment
Fabric does not arrive at a sewing table ready to wear. Between the field and the finished piece it is spun, knitted or woven, scoured, dyed and finished — and each of those steps leaves something behind, even when the process is a clean one.
- Unfixed dye. Not every dye molecule bonds to the fibre. The surplus rinses out in the mill, but some always survives to the first home wash — which is why a new deep-dyed piece can tint the water.
- Finishing agents. Conventional textiles are often treated for wrinkle resistance, softness or water repellency. Easy-care and wrinkle-free finishes have historically relied on formaldehyde-releasing resins; water and stain repellents have relied on fluorinated chemistry.
- Handling residue. Garments are folded, bagged, shipped across continents and, in a shop, tried on. Dust, packaging fibres and other people's hands are the least exotic reason to run a wash.
Not all of this applies equally. A GOTS-certified organic cotton piece has already ruled out the worst of the list at source — more on that below.
What EU rules already keep out
Clothing sold in the EU is not unregulated. REACH — the EU chemicals regulation — sets binding limits on what can be present in textiles, and children's clothing is treated more strictly than adult clothing in several places.
| Rule | What it covers |
|---|---|
| REACH Annex XVII, entry 72 | Restricts a list of carcinogenic, mutagenic and reprotoxic substances in clothing and footwear, including a formaldehyde limit of 75 mg/kg for consumer textiles in direct skin contact. |
| REACH azo dye restriction | Bans azo dyes that can release listed carcinogenic aromatic amines above 30 mg/kg (0.003%) in textiles with prolonged skin contact. |
| OEKO-TEX STANDARD 100, Product Class I | A voluntary certification applying its strictest limits to articles for children under 36 months — including a far tighter formaldehyde threshold than the legal one, and no formaldehyde-containing finishes. |
| GOTS | Prohibits formaldehyde, chlorine bleach, toxic heavy metals and azo dyes that release carcinogenic amines throughout processing — so the chemistry is controlled at the mill, not just measured at the end. |
That last row is the honest reason certification is worth the paperwork. A limit tested on a finished garment tells you what survived. A processing standard like GOTS tells you what was never allowed in.
So why still wash it?
Because compliance is a ceiling, not a promise of zero — and because a wash does more than remove chemistry.
Loose dye is the practical one. Rinsing it out before the garment meets a car seat, a pale sofa or a lighter-coloured sibling saves a lot of grief later. Washing also relaxes the fibres: cotton jersey straight off the roll can feel stiffer than it ever will again, and one cycle softens it. And if anyone in the house has eczema or reacts to detergent residues, starting the garment's life in your own detergent — rather than someone else's — removes a variable.
There is a second, less obvious benefit. Cotton does most of its shrinking in the first wash. Prewashing an oversized piece means the fit you see on day one is the fit you keep, rather than discovering the change halfway through a school term.
How to prewash without ruining anything
- Read the label first. One cycle at the temperature on the care label — usually 30 °C for organic cotton jersey — is enough. Hotter is not better; it costs energy and shrinks cotton faster.
- Wash new colours separately the first time. Especially indigo denim and deep terracotta or rust tones. After the first two or three washes they behave.
- Use a plain, fragrance-free detergent, and less of it than the cap suggests. Excess detergent is one of the most common causes of stiff, itchy laundry.
- Skip the fabric softener. It coats fibres, reduces absorbency and is a frequent trigger for sensitive skin — organic cotton does not need it.
- Turn things inside out and skip the tumble dryer where you can. Line-drying is gentler on prints, elastane cuffs and the planet, and it is how a garment stays hand-me-down-ready.
What about second-hand and hand-me-downs?
Different question, same answer. With pre-loved pieces the concern is not manufacturing residue — that left long ago — but storage: dust, damp, another household's detergent and, occasionally, a smell that has settled in. A normal wash handles almost all of it. For anything that has been boxed in a loft or a cellar for a season, an overnight soak in cool water with a spoon of soda crystals before the cycle does the rest.
It is also the moment to check seams, buttons and any cords or drawstrings before the garment goes back into rotation — the point at which a piece is passed on is exactly when small repairs are easiest.
FAQ
Do I need to wash organic cotton clothes before wearing them too?
Yes, though for different reasons. GOTS processing already rules out formaldehyde, chlorine bleach and azo dyes that release carcinogenic amines, so there is far less to remove. The wash is mostly about loose dye, packing dust and softening the fibres.
Is one wash enough?
For most garments, yes. Deeply dyed items — indigo denim especially — will keep releasing a little colour for a few washes, so keep them away from pale laundry at first.
What temperature should I use?
Follow the care label. For organic cotton jersey that is usually 30 °C. A warm-but-not-hot wash cleans effectively without accelerating shrinkage or fading.
Which detergent is best for baby clothes?
A simple, unscented, dye-free one, dosed sparingly. Skip fabric softener and optical brighteners. If your child has eczema, an extra rinse cycle is worth more than any special "baby" formula.
Will prewashing shrink the clothes?
Cotton does most of its shrinking in the first wash, so a small amount of change is normal and expected — it is one reason our cuts run oversized. Washing cool and line-drying keeps it minimal.
Are clothes without a certification unsafe?
Not necessarily — anything legally sold in the EU has to meet REACH limits regardless. Certifications like GOTS and OEKO-TEX go further and, importantly, are independently verified rather than self-declared.
Keep exploring
- How to Wash and Care for Organic Cotton Kids Clothes
- Dressing Kids with Eczema or Sensory Sensitivities: A Fabric & Fit Guide
- Kids' Clothing Safety: Drawstrings, Buttons and Loose Parts
- Cotton, Linen, or Bamboo? The Best Fabrics for Kids in Summer Heat
Everything we make is GOTS-certified organic cotton, cut oversized so it lasts through more than one child. Have a look at the full collection, or at Twice Loved if you would rather give a piece its second life.