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Kids' Clothing Sizes: Age, Height, and How US, EU, and UK Systems Compare

Kids' clothing sizing is inconsistent across countries, but most systems ultimately anchor to the same two things: age range and height.

Height is a more reliable guide than age alone

Children of the same age can vary by several centimeters in height and build, so a size chart based purely on age is a rough estimate β€” checking a brand's height range for a labeled size gives a much better fit than assuming age alone.

US sizing splits into toddler and regular kids ranges

US toddler sizes (2T, 3T, 4T) are cut differently from regular kids sizes (4, 5, 6) even at overlapping ages, generally with more room for diapers and a looser fit, so a 4T and a size 4 are not simply the same size with different labels.

EU sizing numbers are usually the child's height in centimeters

European kids' sizing typically labels garments directly by height, such as 92, 98, or 104, meaning the size is intended for a child of roughly that height in centimeters β€” a more direct measurement-based system than the US age-based labels.

UK sizing is age-based but usually printed alongside a height guide

UK children's clothing is commonly labeled by age range (like 2-3 years or 4-5 years) similar to the US, but many UK retailers also print the expected height range on the label, functioning as a built-in cross-check against the age number.

Buying slightly ahead of current size is a common practice

Because children grow quickly, many parents deliberately buy one size above a child's current measurement, especially for items like coats or shoes that are more expensive to replace often.

Why height-based sizing is generally considered more accurate

Age-based labels have to average across a wide range of body types for children of the same age, while a height-based label ties the garment more directly to an actual body measurement. This is a large part of why converting from an EU height-based size to a US age-based size works better as height-to-height, then translating that height into the closest US age range, rather than matching age numbers directly across systems.

The toddler-to-kids transition is a common sizing pitfall

Because toddler sizes and early kids sizes can overlap in labeled age but differ in cut, parents switching from toddler to regular kids sizing for the first time often find a labeled size doesn't fit the way the previous system's sizes did, which is why checking the actual height and weight range printed on the label matters most at this transition point.

Frequently Asked Questions

How do I convert an EU height-based kids size to a US size?

Match your child's actual height in centimeters to the EU number first (since EU sizes are usually just height in cm), then look up which US age-range size typically corresponds to that height, rather than trying to match the EU number directly to a US age label.

Should I size up if my child is between two sizes?

For fast-growing kids and items that get heavy use, sizing up is common practice, but for items where fit matters more than longevity, such as shoes, checking the specific brand's width and length guidance is usually more reliable than simply rounding up.