Kids clothing · EU/UK height size 104
What age is size 104 in kids clothes?
Size 104 is a height size: it is cut for a child about 104 cm (3 ft 5 in) tall. Typical age: 3.7 years to 4.6 years. Closest US size: 4T.
The short answer
In UK and EU kids' clothing the size number is body height in centimetres, so size 104 suits a child about 104 cm tall. A 6 cm step between sizes means one size covers roughly 101 to 107 cm. On the CDC and WHO growth charts the median boy reaches 104 cm at 4.1 years and the median girl at 4.2 years. Children in the 101 to 107 cm band are typically 3.7 years to 4.6 years old. Because children vary a lot, the 3rd to 97th percentile range (the middle 94 percent of children) means a 104 cm child can be anywhere from 3.1 years to 5.8 years. That is typical growth, not a fit guarantee: brands run small or large, and children grow, so size up one bracket for growth room.
Use the calculator with your child's exact height, age or foot length to get EU/UK, US and shoe sizes.
Neighbouring sizes
| EU/UK size | Height it suits (read from the 6 cm step) | Typical age (median height) | Closest US size |
|---|---|---|---|
| Size 98 | 95-101 cm | 2.9 years to 3.7 years | 3T |
| Size 104 | 101-107 cm | 3.7 years to 4.6 years | 4T |
| Size 110 | 107-113 cm | 4.6 years to 5.7 years | 5T / 5 |
Heights at age 4 (CDC/WHO)
For comparison, the middle 94 percent of 4-year-old boys are 95-111 cm (median 103); girls 95-111 cm (median 103). Values are the 3rd to 97th percentile with the 50th percentile (median) in brackets. Percentiles describe how children vary; they are not a health assessment.
How this was worked out
Size 104 is read as height 104 cm. The age at which the median height reaches 104 cm comes from the WHO standards (to age 5) and CDC charts (age 5 and up), linearly interpolated between published points. The "typical" band is the age the pooled boy-and-girl median passes 101 cm to the age it passes 107 cm. The wide range is the age the 97th percentile child is 104 cm to the age the 3rd percentile child is 104 cm. The US size is the age size nearest the pooled median age for 104 cm; US sizes are labelled roughly by age, and the CPSC rules in 16 CFR 1615 and 1616 list size names only, not heights.
Sources and as-of date. Height data: CDC stature-for-age percentile data (2 to 20 years) (CDC growth charts) and WHO Child Growth Standards, length/height-for-age (0 to 5 years). Size designation: the EN 13402 series (ISO 3635 lineage) uses body height in centimetres as the primary dimension for children's clothing. US size names: 16 CFR 1615 and 16 CFR 1616 (CPSC sleepwear rules list sizes 9-12 months up to 14, but give no height chart). Shoe sizing: ISO/TS 19407:2023. Data files read on 2026-10-02.
Frequently asked questions
What age is size 104 in kids UK clothes?
UK and EU kids' sizes are height sizes, so size 104 is cut for a child about 104 cm (3 ft 5 in) tall, not for a set age. By CDC and WHO median heights, children are typically 3.7 years to 4.6 years old when they are 101 to 107 cm tall. Brands print age labels too, and those can differ from this figure, so trust the height.
Should I buy size 104 or size 110?
Measure your child barefoot against a wall. If they are about 104 cm, size 104 fits now; if you want room to grow or the brand runs small, take size 110. Children grow roughly 5 to 7 cm a year between ages 4 and 10, so one size up is usually good for a season.
Is size 104 the same in the US?
Not exactly. US sizes are labelled roughly by age in years, and there is no single public height chart. Matching by the median age for 104 cm gives about size 4T (5T / 5 is the next one up). Check the brand's own chart.