Washing baby clothes: what actually matters for delicate skin

The baby aisle wants you to believe your newborn’s sleepers need their own bottle of detergent. They don’t. What newborn skin needs is less of the stuff that causes trouble, and that comes down to reading the ingredient list, measuring properly and rinsing well. Here is what the science and Canadian paediatric guidance actually say.

Why newborn skin is different

A baby’s skin looks perfect, but it is still finishing its construction. A 2025 review in Allergy, Asthma and Immunology Research describes neonatal and infant skin as thinner, more permeable and less developed than adult skin, which makes it more vulnerable to irritants, infection and dehydration. Its surface acidity is also still settling in the first weeks and months of life; that mildly acidic surface is part of how the skin barrier, the outer layer that keeps water in and irritants out, defends itself.

The same review’s practical conclusion is simple: mild, fragrance-free products, and care tailored to each baby. A thinner, more permeable barrier means whatever stays in the fabric has an easier time getting through.

There is also an intriguing animal study. In 2022, researchers applied laundry detergent to the skin of mice and found it damaged the barrier, increased water loss and made the animals easier to sensitize to an allergen, with newborn tissue being the most vulnerable. Mice are not babies, and the amounts used were not the traces left in washed cotton, but the direction of the finding fits with everything else we know.

Do you need a “baby” detergent?

The word “baby” on a laundry product is a marketing choice, not a description of what is inside, and the products in that category vary enormously.

The clearest evidence comes from a 2020 analysis in the journal Dermatitis of 65 top-selling laundry products in the United States. Fragrance was the most common contact allergen in every category, and among products labelled “baby safe,” 80 percent contained methylisothiazolinone, a preservative from the isothiazolinone family well known for causing contact allergy. Products labelled as free of dyes and fragrance did a bit better, but 57 percent still contained it.

So the label does not tell you what you need to know. The ingredient list does. What you are looking for is a detergent with no added fragrance and no dye, and ideally without isothiazolinone preservatives (look for names ending in “-isothiazolinone”). Plenty of regular, whole-family detergents meet that description, which means one bottle can do everyone’s laundry.

If you want to see how fragrance-free products describe themselves, browse the laundry products the panel has reviewed.

Fragrance-free and dye-free: the two things that matter

The Canadian Paediatric Society lists laundry detergents, dyes in clothing and even the metal snaps on undershirts among the irritants that can cause contact dermatitis in babies, which is a rash where skin has touched something irritating or something it is allergic to. The American Academy of Dermatology likewise names laundry detergent and fabric softeners among the products that can trigger or worsen eczema in babies, and warns particularly about fragrance in anything that touches their skin.

Fragrance is the ingredient to remove first, because it is one of the most common causes of contact allergy and does nothing for cleaning. As the American Academy of Dermatology explains, “fragrance-free” means free of all fragrances, even ones you cannot smell, while “unscented” means a fragrance has been masked so you cannot smell it. They are not the same thing. Dyes are simpler: they only colour the detergent, so a dye-free formula gives up nothing.

Dose, rinse, and the case for an extra rinse

Detergent that stays in fabric is mostly a dosing and rinsing problem. Surfactants, the cleaning molecules that lift grease and dirt, are what rinse water carries away; the more you add and the less water there is to rinse, the more stays in the fibres. Baby clothes are small, and it is easy to use a full adult dose for a half-full drum.

Practical habits:

• Measure the detergent for the load size, and lean toward less. Concentrated formulas need far less than the cap suggests.
• Leave room in the drum. A packed load cannot rinse.
• Use the extra-rinse setting if your machine has one. The Canadian Paediatric Society’s advice on preventing skin irritation from soap during baths applies just as well here: rinse well.

Nobody has run a trial proving the extra rinse prevents baby rashes. It costs nothing, removes more of what might irritate, and that is a good enough reason.

Softener, dryer sheets and fragranced extras

Fabric softeners and dryer sheets work by leaving a thin coating on fibres, and that coating almost always carries fragrance. On a baby, that means fragrance on every sleeper, blanket and crib sheet, all day and all night. The American Academy of Dermatology includes fabric softeners among the possible triggers of eczema in babies. The simplest approach is to leave them out entirely; dryer balls or a slightly shorter dry cycle handle static and stiffness without adding anything to the fabric.

The same goes for scent boosters, scented stain sprays and anything else that promises a “fresh” smell. Fresh, for a baby, means nothing added.

Wash new clothes before the first wear

New garments carry dye that is not fully set, finishing chemicals applied at the factory to keep fabric crisp, and whatever they touched in the warehouse and on the shelf. The American Academy of Dermatology’s advice for eczema-prone skin is to wash new clothes before wearing them to remove excess dyes and fabric finishers, and there is no reason to treat a newborn’s wardrobe differently. One ordinary cycle with your fragrance-free detergent is enough.

While you are sorting the new clothes, favour soft, loose cotton. The Canadian Paediatric Society suggests dressing babies in loose cotton fabrics and avoiding wool. The American Academy of Dermatology adds two details for eczema-prone children: cut the tags off clothes, and choose loose-fitting garments.

When a rash is not about the laundry

Newborns get plenty of rashes that have nothing to do with the washing machine, from cradle cap (seborrheic dermatitis, the flaky scalp condition) to eczema to plain dry skin. If you have switched to a fragrance-free routine and a rash persists, the laundry is probably not the cause.

If a rash is spreading, weeping, crusting, seems painful, or has not improved after two weeks of gentle care, see your doctor or pharmacist. Babies with persistent eczema benefit from a proper plan, and the Canadian Paediatric Society’s basic advice, an unscented moisturizer applied to trap water in the skin, is a good start while you wait.

What to remember: skip the “baby” label and read the ingredients. Fragrance-free, dye-free, measured for the load, rinsed well, no softener, and new clothes washed first. That is the whole routine, and one bottle can serve the whole family.