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Size recommendations are based on official brand size charts and are provided as a guide only. Fit may vary by item, style, and individual child. Outgrow is not responsible for sizing decisions made based on these recommendations.
Uniqlo is one of the fastest-growing kids' clothing brands in both the US and UK — and one of the most confusing to size for Western parents. The Japanese brand uses a height-based sizing system (80, 90, 100, 110, 120, 130, 140, 150, 160) rather than age labels, the clothes are cut for slimmer Japanese body proportions, and the quality of items like the Ultra Light Down jacket and Heattech base layers makes parents want to get sizing right the first time because they're investing in pieces that last. Uniqlo is one of 38 brands in our complete kids' clothing size chart.
This guide covers the complete official Uniqlo kids size chart, explains the Japanese sizing system in plain terms, covers the key fit quirks, and compares Uniqlo to H&M, Zara, Gap, and Carter's.
Does Uniqlo Kids Run Small, Large, or True to Size?
Uniqlo kids runs small and slim compared to US and European brands. The sizing is calibrated for Japanese children who tend to have slimmer proportions than Western children at the same height. This is the most important thing to know before buying Uniqlo kids clothing.
Understanding Uniqlo's Kids Sizing System
Uniqlo uses height in centimetres as the size label — so size 110 is designed for a child who is approximately 110cm tall. This is straightforward once you know it, but trips up parents used to age-based US sizing or European age ranges.
| Uniqlo Size | Approx Age | Height | US Equivalent |
|---|---|---|---|
| 80 | 12–18 months | 80–86cm | 18–24M |
| 90 | 2–3 years | 86–98cm | 2T–3T |
| 100 | 3–4 years | 98–104cm | 4T |
| 110 | 4–6 years | 104–116cm | 5–6 |
| 120 | 6–7 years | 110–122cm | 6X–7 |
| 130 | 7–9 years | 122–135cm | 8 |
| 140 | 9–10 years | 135–145cm | 10 |
| 150 | 11–12 years | 145–152cm | 12 |
| 160 | 13–14 years | 152–163cm | 14–16 |
Uniqlo Kids Size Chart — Full Measurements
Official measurements from Uniqlo's body measurement size chart.
| Uniqlo Size | Age Guide | Height | Weight | Chest |
|---|---|---|---|---|
| 80 | 12–18M | 80–86cm / 31–34" | 10–12kg / 22–26 lbs | 48–50cm / 19–20" |
| 90 | 2–3Y | 86–98cm / 34–38.5" | 11–15kg / 24–33 lbs | 50–52cm / 20–20.5" |
| 100 | 3–4Y | 98–104cm / 38.5–41" | 15–17kg / 33–37 lbs | 54–56cm / 21–22" |
| 110 | 4–6Y | 104–116cm / 41–45.5" | 17–19kg / 37–42 lbs | 56–58cm / 22–23" |
| 120 | 6–7Y | 110–122cm / 43–48" | 19–26kg / 42–57 lbs | 58–64cm / 23–25" |
| 130 | 7–9Y | 122–135cm / 48–53" | 24–31kg / 53–68 lbs | 64–69cm / 25–27" |
| 140 | 9–10Y | 135–145cm / 53–57" | 29–36kg / 64–79 lbs | 69–72cm / 27–28" |
| 150 | 11–12Y | 145–152cm / 57–60" | 33–41kg / 73–90 lbs | 72–76cm / 28–30" |
| 160 | 13–14Y | 152–163cm / 60–64" | 41–50kg / 90–110 lbs | 76–82cm / 30–32" |
Uniqlo Kids Sizing by Product Category
Uniqlo's slim cut affects different product types differently. Here's what to expect across their main kids' categories:
Tops and t-shirts
Run slim across the chest and body. This is where the slim Japanese cut is most noticeable. Size up one if your child has a broader chest or is between sizes.
Fleece and sweatshirts
Similar slim cut to tops. The AIRism and Heattech base layers in particular run very close-fitting by design — they're performance layers meant to sit next to the skin. For base layers, the fit should be snug but not restrictive.
Trousers and jeans
The waist runs slim and the leg length is proportionate to the height label. For children with a rounder build, size up. The Ultra Stretch jeans are more forgiving than their regular-fit denim.
Ultra Light Down jacket
Uniqlo's most popular kids' outerwear and worth sizing carefully. The jacket runs slim and is designed to be worn over light layers. If your child will wear it over a thick hoodie in winter, size up two from your normal Uniqlo size. Over a thin t-shirt, size up one.
Heattech
Designed to fit close to the body for thermal performance. Size up one from your child's normal Uniqlo size for a comfortable fit that still performs as intended.
How Uniqlo Kids Compares to Other Brands
| Brand | vs. Uniqlo |
|---|---|
| Carter's | Carter's runs much more generously. A child in Carter's 4T typically needs Uniqlo 110–120. |
| H&M | Both use cm-based sizing but H&M runs more generously. H&M 110 (4–5Y) is roughly Uniqlo 120. |
| Zara Kids | Zara is similarly slim. The two brands are the closest in cut — both run small for Western children. |
| Gap Kids | Gap runs larger. A child in Gap XS (4–5) typically needs Uniqlo 110–120. |
| Old Navy | Old Navy runs larger than Gap. Size up two from Old Navy to Uniqlo. |
| Next (UK) | Next runs true to age and more generously than Uniqlo. A child in Next 4–5Y needs Uniqlo 110–120. |
| Primark | Primark runs closer to true size than Uniqlo. Size up one from Primark to Uniqlo. |
| Nike Kids | Athletic cut. Nike runs slightly more generously than Uniqlo. |
Uniqlo vs H&M — The Most Common Comparison
Both brands use European height-based sizing in cm, which makes parents assume they're interchangeable. They're not. H&M's sizing is more generous — the waist and chest are cut wider for the same height label. A child at 110cm who wears H&M 110 comfortably may find Uniqlo 110 too tight across the chest and should try Uniqlo 120.
How Long Will Uniqlo Kids Clothes Last?
Uniqlo's quality is genuinely above average for the price — their fleece, Down, and Heattech pieces in particular hold up well over multiple seasons if sized correctly. The slim cut means height is the primary limiting factor rather than waist.
| Uniqlo Size | Average Wear Time |
|---|---|
| 80 | 3–5 months |
| 90 | 5–8 months |
| 100 | 6–9 months |
| 110 | 8–12 months |
| 120 | 9–13 months |
| 130 | 10–14 months |
| 140 | 11–15 months |
| 150 | 12–16 months |
| 160 | 13–18 months |
Frequently Asked Questions
Does Uniqlo kids run small?
Yes — Uniqlo kids runs small and slim compared to US and European brands. The sizing is calibrated for slimmer Japanese body proportions. Most Western parents need to size up one, sometimes two sizes. If your child normally wears H&M 110, start with Uniqlo 120.
What does the Uniqlo size number mean?
The size number is the height in centimetres the garment is designed for. Size 110 is for a child approximately 110cm tall, size 130 for 130cm, and so on. This is more reliable than age labels once you know your child's height — just match their height to the size number and then size up one for the slim cut.
How does Uniqlo size 110 compare to US sizes?
Uniqlo 110 is roughly equivalent to US size 5–6 in terms of height range, but because Uniqlo runs slim you may need size 120 for the same child who wears US size 5. Height is 104–116cm.
Is Uniqlo good for stockier or broader children?
Less so than brands like Carter's, Gap, or Old Navy which are cut more generously. For children with a broader chest or rounder build, sizing up two from the height-based size is often necessary, and some styles may simply not fit comfortably regardless of size. H&M and Zara have similar issues; Carter's or Gap are better alternatives for broader builds.
How should I size the Uniqlo Ultra Light Down jacket for kids?
Size up one from your child's normal Uniqlo size if they'll wear it over light layers, or up two if they'll wear it over a thick hoodie or fleece. The jacket runs slim and is not designed to accommodate heavy layering at the labelled size.
Does Uniqlo kids sizing differ between boys and girls?
The size chart is the same — Uniqlo uses unisex height-based sizing for children's clothing. Individual items may be cut slightly differently but the size number itself refers to the same height range regardless of gender.