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My Gym – Children’s Shirt Size Guidelines

When you are ordering children’s shirts, please use this chart as a guideline.



Recommended T-Shirt Size

6 weeks to 13 months

Little Bundles, Tiny Tykes

12 months, 18 months

14 months to 22 months


18 months, 2T

23 months to 2 ½  years



2 ½ to 3 ½ years

Terrific Tots

3T, X-Small

3 ½ to 4 ½ years

Mighty Mites


4 ½ to 6 years

Whiz Kids

X-Small, Small

6 to 9 years

All Star Sports, Champions

Small, Medium

9 to 13 years

Cardio Kids

Medium, Large

Keep in mind that children come in all shapes and sizes, therefore the above guidelines will not always hold true.  The best practice is to purchase registration packs and children’s shirts according to the above guidelines; but, when giving away a registration pack or selling a shirt, hold the shirt up to the child’s body to make sure it is appropriate.  You may even have the child try it on, if necessary.  Then, when you are ordering more registration packs and shirts, consider how your stock has depleted.