How Much Do Kids' Clothes Shrink After Twenty Washes

Short answer: about a centimetre, sometimes two.

We know because we washed them. Not once, and not carefully. Our own garments, through ordinary household washes, over and over, and then measured against unwashed ones of the same size.

That is the number most brands will not give you, and it is the number that decides whether the 3-4y you buy in October still fits in March.

What we found

Across our garments, twenty washes took roughly 1 to 2 centimetres off. Not per wash. In total, across the whole twenty.

Two things matter more than the number itself.

Most of it happens early. Cotton does the bulk of its shrinking in the first few washes and then largely stops. By about the fifth wash you have seen most of what you are going to see. It is not a slow slide over a year, which is what parents usually fear and what makes people size up unnecessarily.

Where the centimetre lands changes everything. A centimetre off a body length you barely notice. A centimetre off a leg opening or a cuff on a 12-18m piece is a different story, because the starting measurement is small. The same absolute loss is a much bigger proportion.

Is one to two centimetres a lot?

No. It is ordinary for cotton, and on the better end of ordinary.

Shrinkage is normally expressed as a percentage rather than a distance, because a centimetre means different things on different garments. Cotton knits typically move somewhere between three and eight per cent over their life. Untreated cotton can lose three to five per cent in the first wash alone. Fabric that has been pre-shrunk before it is cut moves less.

On kids' sizing, one to two centimetres generally works out around three to six per cent, depending which measurement you are looking at. So: normal, and nothing that should change the size you order.

For reference, the international method for measuring this is ISO 5077, which sets out how dimensional change is calculated from before-and-after measurements, paired with ISO 6330 for the washing procedure itself. Two per cent is the tolerance often applied to uniforms, which is a far stricter bar than anyone applies to children's clothing.

What we are not going to pretend

We have the range. We do not have a published table of every garment, in every size, before and after.

So we have not written one. A table that looks precise but was estimated is worse than no table, because someone orders against it. When we have measured every step, it will appear here.

How to lose less of it

The washing matters less than the drying. Heat is what does the damage, and a tumble dryer applies far more of it than a hot wash ever will.

• Wash cold. Thirty degrees is plenty for kids' clothes that are not actually filthy.
• Line dry. This is the single biggest lever, and in an Australian summer it costs nothing.
• Skip the dryer entirely where you can. If you must use one, low heat, and take things out slightly damp.
• Turn prints inside out. This does nothing for shrinkage but it keeps the print alive, which is the other thing that ages a garment.

The care symbols on the label are standardised by GINETEX, the body that owns the international care labelling system, so the symbols on ours mean the same thing they mean on anything else in the wash basket.

What this means when you are choosing a size

Our sizing already runs oversized by design. That is a choice, not an accident, and it is there so a piece lasts more than one season.

So the shrinkage is mostly absorbed by room that was already built in. It is not a reason to size up. Order the size that matches the child now, and check the measurements on the size guide rather than going by the age on the label, because age labels are not consistent between brands.

If the child is between sizes, that is the only case where we would think about it, and even then we would look at the actual centimetres before guessing.

A note on what “shrinkage” actually measures

Worth saying plainly, because the word does a lot of work.

Shrinkage is not damage. A cotton fibre is spun and knitted under tension, and the first few washes let it relax back toward the length it wanted to be. That is why the change is front-loaded and why it stops. A garment that has settled is a garment that has finished moving, and it will hold that shape for the rest of its life if you keep it out of the dryer.

This is also why kids clothes shrinkage after washing is a fairer thing to judge a brand on than the measurement on day one. Anyone can cut a garment to a number. What it measures after a season of daycare, sand and repeated washing is the thing that decides whether it gets handed down or thrown out.

Why we bothered

Because “will it still fit after a few washes” is a real question and the usual answer is a shrug.

Most brands write “may shrink slightly” on a care label and leave it there. That sentence is on the back of almost every cotton garment sold, and it tells you nothing. We would rather hand you a number, say where it came from, and be held to it.

We will keep adding to this page as we measure more of the range.

The shorts are here if you want them, and the gingham shorts are the pair we measured most.

Measurements are production spec — the dimensions the garments are cut to, laid flat, in centimetres. The 1–2cm shrinkage range was measured by us across repeated household washing. Neither figure is independently re-measured against current stock.