Most kids t-shirt size charts sort by age, but age is the least reliable way to size a t-shirt. Two 6-year-olds can need two totally different sizes. The safest way is to measure your child's height and chest in cm, then match that number to a size chart, not the age label on the shirt. Below you'll find a full size chart by age and measurement, a simple way to measure your child at home, and answers to the questions parents ask most before buying.
Why Age-Based Sizing Doesn't Always Work
A shirt labeled "6-7 years" assumes an average build for that age group. But kids grow at different speeds. A tall, lean 5-year-old might need a 6-7 shirt for length, while a shorter, sturdier 7-year-old might still fit a 4-5. Brands also don't agree on what "age 6" means, one label might say 6Y, another 116cm, another just "M." That's why chest and height measurements give a far more accurate fit than age alone, and why every size chart below lists both.
Kids T-Shirt Size Chart by Age, Height and Chest
This chart covers toddlers through teens, using both cm and inches so it works whether you're shopping locally in the UAE or from an international brand.
| Age Range | Size Label | Height (cm) | Height (in) | Chest (cm) | Chest (in) |
|---|---|---|---|---|---|
| 6-9 months | 74 | 69-74 | 27-29" | 47 | 18.5" |
| 1-2 years | 92 | 87-92 | 34-36" | 52.5 | 20.5" |
| 2-3 years | 98 | 93-98 | 36.5-38.5" | 54.5 | 21.5" |
| 3-4 years | 104 | 99-104 | 39-41" | 56 | 22" |
| 4-5 years | 110 | 105-110 | 41.5-43.5" | 58 | 23" |
| 5-6 years | 116 | 111-116 | 44-45.5" | 60.5 | 24" |
| 6-7 years | 122 | 117-122 | 46-48" | 63 | 24.5" |
| 7-8 years | 128 | 123-128 | 48.5-50.5" | 64 | 25" |
| 8-9 years | 134 | 129-134 | 51-53" | 67.5 | 26.5" |
| 9-10 years | 140 | 135-140 | 53.5-55" | 71 | 28" |
| 10-11 years | 146 | 141-146 | 55.5-57.5" | 74.5 | 29.5" |
| 11-12 years | 152 | 147-152 | 58-60" | 78 | 30.5" |
| 12-13 years | 158 | 153-158 | 60.5-62" | 82 | 32.5" |
Figures are averaged from standard European and UAE retail size charts. Always check the exact chart on the product page too, since cut and fabric change the fit slightly from brand to brand.
Once you know the right size, browse our full range of t-shirts for kids in UAE to shop by age or size.
How to Measure Your Child for a T-Shirt (2-Minute Method)
You only need a soft measuring tape and two minutes. Here's the order that works best:
- Chest – Wrap the tape under the arms, around the fullest part of the chest. Keep it snug but not tight. This is the most important number for a t-shirt.
- Height – Stand your child against a wall, heels touching, and measure from the floor to the top of the head.
- Shoulder width (optional but useful for older kids) – Measure across the back from shoulder tip to shoulder tip. This tells you if the sleeves will sit right.
Write both numbers down. If chest and height point to two different sizes, go with the size that matches the chest measurement first, a slightly long shirt is fine, but a tight chest isn't comfortable for a child who's moving around all day.
Choosing Between Two Sizes
This is where most parents get stuck, so here's a simple rule:
- Chest measurement is snug, height matches the next size up → go up a size. Kids grow taller faster than they grow wider, so a longer shirt still works, a tight one doesn't.
- Your child is between sizes and still growing fast (under 8 years old) → size up, since growth spurts happen every few months at this age.
- Your child's growth has slowed (early teens) → size closer to the actual measurement, since they'll wear the shirt longer before outgrowing it.
- Buying for summer or UAE heat → size true or slightly loose rather than tight. A snug fit traps heat and feels uncomfortable in humid weather.
Fabric and Shrinkage: A Number Most Charts Skip
Most size charts don't mention this, but it changes what size you should actually buy. 100% cotton t-shirts typically shrink 3-5% after the first wash, especially in a warm dryer. That's roughly 1-2 cm off the length and chest. Cotton-polyester blends shrink far less, usually under 1%. If you're buying a 100% cotton t-shirt and your child's measurement is right on the border of two sizes, size up. If it's a cotton-poly blend, you can size true to measurement.
Regional Sizing: US vs UK vs EU vs UAE Labels
If you're shopping across different stores in the UAE, you'll run into different labeling systems on the same shelf. Here's roughly how they line up for a 6-7 year old with a 63cm chest:
| Region | Typical Label | Chest (approx) |
|---|---|---|
| UAE / EU | 116-122 or "6-7 Years" | 60.5-63 cm |
| US | Youth XS / Size 6 | 24-24.5" |
| UK | Age 6-7 | 24-25" |
The label changes, but the actual chest measurement in cm is the most reliable thing to compare across brands. When in doubt, ignore the letter or age on the tag and go straight to the cm number.
Toddler vs Youth Sizing: What's the Difference
"Toddler" sizes (sometimes labeled 2T, 3T, 4T, or by age up to about 4 years) are cut fuller around the diaper area and shorter in the body. "Youth" or "Kids" sizes start around age 4-5 and follow a slimmer, more grown-up cut. If your child has just turned 4 and still wears diapers or pull-ups, stick with toddler sizing even if the age matches youth. If they've moved past that stage, youth sizing usually gives a better shape.
Frequently Asked Questions
What size t-shirt fits an 8-year-old?
Most 8-year-olds fit a 128-134cm size, roughly chest 24-26.5". But check your child's actual chest measurement first, since builds vary a lot at this age.
Is it better to size up or down for kids' t-shirts?
Size up if your child is growing quickly, wearing 100% cotton (which shrinks), or between two sizes. Size down or true-to-measurement only if growth has slowed and the shirt won't be handed down.
Do kids' t-shirt sizes differ between boys and girls?
Slightly. Girls' tees are usually cut a bit narrower in the shoulders with a more tapered body. Boys' tees tend to be straighter with a bit more shoulder room. Chest measurement stays the most reliable number for either.
How do I convert kids' age sizing to cm?
Match your child's height in cm to the size chart above rather than relying on the age label alone. Chest measurement is the backup check if height falls between two rows.
Why do t-shirt sizes vary so much between brands?
There's no single global standard for kids' sizing. Each brand sets its own age-to-measurement mapping, so a size labeled for age 6 in one shop can be noticeably different in another. This is exactly why measuring your child directly, rather than trusting the age label, gives you a far more consistent result.
Does a kids' t-shirt shrink after washing?
Yes, if it's 100% cotton, expect around 3-5% shrinkage after the first wash, more with high heat drying. Wash in cool water and air dry when possible to keep the size closer to what you bought.
What's the difference between kids' and youth sizing?
"Kids" or "toddler" usually covers ages up to about 4-5 years with a fuller cut. "Youth" sizing takes over from around age 4-5 through the young teen years with a slimmer, more adult-shaped cut.
