Most 6 year olds wear a youth extra small or youth small in t-shirts. A 6 year old who is 3 foot 8 and lean fits youth XS in most brands. A 6 year old who is 4 feet tall and average weight needs youth small. The exact size depends on chest measurement and height, not just age.
Shirt Sizes for 6 Year Olds by Brand
| Brand | Youth XS Chest (in) | Youth Small Chest (in) | Best Fit for Average 6yr |
|---|---|---|---|
| Gildan | 24-26 | 28-30 | Youth XS or Small |
| Bella+Canvas | 22-24 | 26-28 | Youth Small |
| Comfort Colors | 24-26 | 28-30 | Youth XS or Small |
| Next Level | 22-24 | 26-28 | Youth Small |
| Hanes | 24-26 | 28-30 | Youth XS or Small |
Six is the transition age from toddler sizing to youth sizing for many kids. If you have been buying toddler sizes (2T, 3T, 4T, 5T), youth XS is the next step up. Youth XS is cut with different proportions than toddler shirts. The neck opening is narrower, the body is longer relative to width, and the sleeves are shaped like miniature adult sleeves.
Who Fits What at Age 6
The average 6 year old in the United States is about 3 foot 10 and weighs around 45 pounds. That puts most of them in the youth XS to youth small range depending on the brand.
Here is a breakdown by build:
Smaller for their age (3'6" to 3'10", under 40 lbs): Youth XS in all brands. Some smaller 6 year olds might still fit in toddler 5T, but the proportions will be off since toddler shirts are cut wider relative to length.
Average build (3'8" to 4'0", 40 to 50 lbs): Youth XS in boxy brands (Gildan, Hanes, Comfort Colors). Youth small in slim brands (Bella+Canvas, Next Level). This is the most common 6 year old order.
Large for their age (3'10" to 4'2", over 50 lbs): Youth small across the board. The extra chest room will be needed and the length will sit right.
Which Size to Order
If you cannot measure the child, youth small is the safer bet for a 6 year old. It gives room to grow and works across all brands. A slightly oversized youth small on a 6 year old today fits perfectly by their 7th birthday.
For teams and groups with 6 year olds, expect most of the order to be youth XS and youth small with a roughly 40/60 split. A few kids might need youth medium if they are large for their age.
Youth XS vs Toddler Sizes
Youth XS is not the same as toddler 5T or 6T. Toddler shirts are cut with more width relative to length, a wider neck opening, and shorter sleeves. Youth XS is proportioned like a scaled-down adult shirt. The transition from toddler to youth sizing usually happens around ages 5 to 6. For more on how the smallest youth sizes work, see our Youth Extra Small Size Guide.
For how the larger youth sizes work and when adult sizing enters the picture, check our Youth XL vs Adult Small comparison and our Youth XL Size Chart.
What size shirt does a 6 year old wear?
Most 6 year olds wear youth XS or youth small depending on the brand and their build. In boxy brands like Gildan and Hanes, an average 6 year old fits youth XS. In slim brands like Bella+Canvas and Next Level, youth small is the better choice. Measure the chest for the most accurate fit.
Is a 6 year old youth small or extra small?
An average-sized 6 year old typically fits youth XS in Gildan, Hanes, and Comfort Colors, or youth small in Bella+Canvas and Next Level. Larger 6 year olds may need youth small across all brands. When in doubt, size up to youth small for room to grow.
What size is a 6 year old in kids shirts?
In the youth sizing system used by most blank shirt brands, a 6 year old wears youth XS (chest 22-26 inches) or youth small (chest 26-30 inches). This is different from retail kids clothing where a "size 6" or "6X" might be used. Always go by chest measurements rather than age or retail size labels.
Related Sizing Guides
- What Size Shirt for an 8 Year Old?
- What Size Shirt for a 10 Year Old?
- What Size Shirt for a 12 Year Old?
- What Size Is Youth Small?
- Youth Extra Small Size Guide
- Gildan Youth Sizing Guide
- Bella Canvas Youth Sizing Guide
- How to Size Custom Shirts for Youth Sports Teams
Need Custom Shirts for Young Kids?
If you are ordering custom shirts for kindergartners or first graders, we will make sure the smallest sizes in your order print correctly and fit the way they should. Start your order here and tell us the age range.