What Clothing Size Should a 3-Year-Old Wear?

This is one of the questions we get asked most often — and the honest answer is that age alone doesn't tell you much. A 3-year-old who is 104 cm tall and a 3-year-old who is 90 cm tall might need sizes that are two full steps apart. What matters is height.

A typical 3-year-old is somewhere between 92 and 104 cm tall. That range spans two EU sizes:

• EU 92–98: designed for children around 86–98 cm tall, roughly 18 months to 3 years
• EU 98–104: designed for children around 92–104 cm tall, roughly 2–4 years

In US sizing, this usually means 3T or 4T. In UK sizing, it's typically 2–3Y or 3–4Y. But those age labels are just guides — the height is what actually determines the fit.

A few things worth knowing when shopping for a 3-year-old:

• If your child is tall for their age (say, 102–104 cm), they may already need EU 104–110, which is labelled as 4–5Y in many brands. Don't let the age label put you off — buy for the height.
• For everyday items like t-shirts and leggings, buying one size up gives room to grow and usually extends wear by several months.
• For fitted items — swimwear, tights, structured trousers — stick closer to the exact height measurement.
• For shoes, a typical 3-year-old has a foot length of around 15–17 cm, which corresponds to EU 24–26.

The most reliable approach: measure your child's height, enter it into our converter on the homepage, and see the size in every system instantly. Then cross-check with the specific brand's size chart before you order.