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Under Armour Kids
Here’s how Under Armour Kids fits your child compared to other brands you might be considering, so you know before it’s in your cart.
What size is (and isn’t) like Under Armour Kids at other brands?
Find your child’s Under Armour Kids size on the left. Twins wear the same number the same way — your size carries straight over. Strangers use the same number but cut it shorter or longer, so don’t trust the label alone.
| Under Armour Kids | Size twinssame number fits the same | Size strangerssame number, different cut |
|---|---|---|
| 0-3M20.5–24" | ||
| 3-6M24–27" | None — a universal size | |
| 6-9M27–29" | None — a universal size | |
| 12M29–30" | ||
| 18M30.5–33" | ||
| 24M33–35" | Bobo Choses↑ longerNew Balance Kids↑ longer | |
| 2T33–35" | Burt's Bees Baby↑ longerCarter's↑ longerGymboree↑ longerLittle Planet by Carter's↑ longerMini Mioche↑ longerOtter Avenue↑ longer | |
| 3T35–38" | Polo Ralph Lauren Kids↑ longer | |
| 4T38–41" | Polo Ralph Lauren Kids↑ longer | |
| 438–41" | ||
| 541–44" | Polo Ralph Lauren Kids↑ longer | |
| 644–46" | Columbia Kids↑ longerBrooks Brothers Kids↑ longerPolo Ralph Lauren Kids↑ longerFabletics↑ longerGap Kids↑ longerGarnet Hill↑ longer+5 more | |
| 6x46.5–48.5" | None — a universal size | |
| 746.5–50" | Levi's Kids↑ longerGarnet Hill↑ longerOld Navy↑ longerThe North Face Kids↑ longerEddie Bauer↑ longerFabletics↑ longer+9 more | |
| YLG58.5–63" | — | No same-size match at other brands |
| YMD53–58.5" | — | No same-size match at other brands |
| YSM51–53" | — | No same-size match at other brands |
| YXL58.5–63" | — | No same-size match at other brands |
| YXS47–51" | — | No same-size match at other brands |
Sizes shown use Under Armour Kids’ girls’/unisex chart where the brand splits by gender; boys’ sizes at the same number can run slightly taller.
In short
Where the number just works. At 3-6M, 6-9M, 6x, YLG, YMD, YSM and more, Under Armour Kids lines up with every brand we track — the size carries straight over.
Where labels drift. The exceptions are the “strangers” above — e.g. at size 3T, Polo Ralph Lauren Kids cut the same number differently. Check those before you trust the label.
Bottom line: for most sizes, a Under Armour Kids number is a safe bet elsewhere — measure once, then double-check only the handful of “stranger” brands above.
Curious about a size that isn’t your child’s here? Every size, compared across every brand, lives here: Browse all size comparisons →
Specialty & inclusive fits
Which trimmer, roomier, or adaptive cuts Under Armour Kids publishes alongside its standard sizes.
Should you buy Under Armour Kids?
Consider it if…
- Its sizing spans a wide range, so one brand can cover several years.
- You care about body fit, not just height — Under Armour Kids publishes chest/waist so you can confirm the cut.
- It offers specialty fits (slim, plus, husky or adaptive) for non-average builds.
- It’s easy to buy — available on Amazon as well as the brand’s own site.
Think twice if…
- Always confirm on the retailer’s live chart before buying — brands revise sizing over time.
Skip the cross-referencing — let Little & Youth do it.
Enter your child’s measurements once. We’ll show their Under Armour Kids size and their size at 100+ other brands, each from that brand’s own chart.
Find my child’s size →Shop Under Armour Kids ↗On Amazon ↗A few things parents ask that the chart won’t tell you
What measurements do I need to size Under Armour Kids accurately?
Under Armour Kids publishes height, weight, chest, waist, hip in its size chart. Height is the primary driver, and the chest/waist figures let you confirm body fit for a child between sizes.
Do Under Armour Kids boys’ and girls’ sizes fit the same?
From the bigger sizes up, Under Armour Kids publishes separate girls’ and boys’ charts, so the same number can differ by gender. The figures on this page use Under Armour Kids’ girls’/unisex chart.
Does Under Armour Kids offer plus sizes?
Yes — Under Armour Kids carries plus options in addition to its standard cut.
Where do I buy Under Armour Kids?
Under Armour Kids is sold on its own site and on Amazon, so you can pick the marketplace you prefer.