US vs EU vs UK Kids Clothing Sizes: What to Settle Before Sampling
Typical scenario (illustrative, not a real case): A brand makes its first samples in US sizes. The founder then decides to sell in Europe and asks the factory for the same line "in EU sizes". The factory asks one question back: should we relabel the same garments, or re-grade them for a different set of body measurements?
That question is the whole topic. A size label is a promise about the body it fits, and the three markets make that promise in different ways. If you are a startup looking for a children's clothing manufacturer for startups, getting this right early saves a sample round later. This article covers sizing systems only. Safety labels and measurement tolerances have their own articles on this blog.
What This Guide Covers
- How US, EU and UK sizing systems are built
- Why conversion charts disagree with each other
- Where infant, toddler and older-kid sizes meet
- How to set a size chart your factory can build from
Three Markets, Two Ways of Labeling
Conversion guides describe the same split. The US, the UK and Australia label children's clothing mostly by age. European countries label by the child's height in centimeters. The EN 13402 series of European standards supports the height-based approach by defining preferred body dimensions for sizing, though parts of that series have since been replaced by ISO 8559, so check which edition your buyer refers to.
| Market | Typical label | Based on | What to watch |
|---|---|---|---|
| US | Months for babies, then 2T, 3T, 4T, then 4, 5, 6, 6X, then 7 to 16 | Age, with a toddler cut | The "T" sizes and the plain numbers sit close together |
| UK | Age ranges such as 2-3 years | Age, often with a height reference | Age bands are wider than a single US size |
| EU | A number such as 92 or 98 | Child height in cm | The label is a body measurement, not an age |
Why Conversion Charts Disagree
Age-based sizes are a rough guide, since children of the same age grow at different rates. That alone makes any age-to-height conversion approximate. It gets worse when you compare charts. One published chart puts a US 2T at 92 to 98 cm. Another puts it at 86 to 92 cm. A third puts it at 83 to 89 cm. All three look reasonable, and none of them is wrong in the sense of a typo. They simply describe different assumptions about the same label.
Charts also say so themselves. One conversion guide warns that sizes vary between manufacturers, and even between designs from the same manufacturer, and tells readers to treat its numbers as approximate. For a factory, that means a conversion chart is a marketing aid and never a production specification. Production needs measurements.
Where Infant, Toddler and Older-Kid Sizes Meet
US sizing runs in stages: baby sizes by months, then toddler sizes with a T, then plain numbers, then the 7 to 16 range. The same US chart that lists 2T, 3T and 4T goes on to list 4, 5, 6 and 6X. So a size 4T and a size 4 both exist, and they are cut for different bodies. The "T" stands for toddler, and toddler sizes typically allow extra room for diapers and movement.
This matters most in two products.
- Baby bodysuit and other baby clothes: the diaper area drives the cut, so a toddler fit is not simply a bigger infant fit.
- Kids t shirts: body length and neck opening change as a child moves from toddler proportions to older-kid proportions, so one size chart rarely stretches across the whole range.
If a line crosses the 2T to 4T boundary, decide where the baby cut ends and the kids cut begins, and write that on the chart.
How to Set a Size Chart Your Factory Can Build From
- Choose the target market first. The same garment can be sold in two markets, but each market needs its own label logic.
- Choose the label type. Age, height, or both. Many brands print both so parents in either system can choose.
- Send body or garment measurements, not only a converted label. Our guide on kids clothing tech packs [internal link] covers where these measurements go in the file.
- Pick a base size and grade from it. Say which size is the base, and how each size steps up or down.
- Test a sample on a real child or fit form. A chart can look right on paper and still fit badly.
- Keep one chart per market. Do not reuse a US chart for the UK or EU by relabeling it.
A kids clothing manufacturer China can build to any of these charts, since size charts are an input from the buyer. If your target market has more than one set of customers, such as the US and the EU, expect to keep a separate chart for each. Our guide on Southeast Asia sizing [internal link] shows what happens when a market has no standard chart at all.
FAQ
Can I use a conversion chart to relabel US sizes as EU sizes?
You can, but it is risky. Published charts disagree by several centimeters for the same US size. Use measurements as the base and let the label follow.
Is EU sizing always height-based?
European labeling is commonly based on height in centimeters, but brands still differ in how they cut each height. Ask for the garment measurements behind the label.
What does the T in 2T mean?
It stands for toddler. Toddler sizes are usually cut with extra room for diapers and movement.
Should I print both age and height on the label?
Many brands do, because it helps buyers in both systems. Which labels are required in your market is a separate legal question, so check it with your compliance contact.
Can the factory work from my own size chart?
Yes. Muhong Apparel produces to the buyer's size chart and target market, and can assist with working through the chart before sampling.
About Muhong Apparel
Muhong Apparel is a children's clothing manufacturer and baby clothing manufacturer in Humen, Dongguan, with 19 years of experience. We build to our customers' own size charts and target markets, and sampling usually takes about 7 days. Our standard quality check follows AQL 2.5. Visit muhongapparel.com to send us your size chart, tech pack or product list.