| T-Shirt Size | Chest | Weight | Generic Age Range |
| 6 mo. | 19" | up to 16 lbs | 3 - 6 months |
| 12 mo. | 21" | 16 - 20 lbs | 7 - 12 months |
| 18 mo. | 22" | 21 - 24 lbs | 13 - 18 months |
| 24 mo. | 23" | 25 - 27 lbs | 19 - 24 months |
| 2T | 24" | 25 - 27 lbs | 2 years |
| 3T | 25" | 28 - 32 lbs | 3 years |
| 4T | 26" | 33 - 36 lbs | 4 years |
| XS Youth | 26" | 36 - 42 lbs | 4 - 5 years |
| S Youth | 28" | 43 - 55 lbs | 6 - 8 years |
| M Youth | 30" | 56 - 73 lbs | 9 - 12 years |
| L Youth | 32" | 74 - 100 lbs | 13 - 16 years |