Kids
| Age |
Letter size |
Waist (INCH) |
| Age 4 |
— |
20-22 |
| Age 6 |
— |
22-23 |
| Age 8 |
SB |
23-24 |
| Age 10 |
MB |
24-26 |
| Age 12 |
LB |
26-28 |
| Age 14 |
— |
28-29 |
Letter sizes are aligned with the closest kids' chest sizes; check the waist measurement for bottoms.
Infants
| Age |
Chest (INCH) |
Waist (INCH) |
Height (INCH) |
| 6 Months |
17.5 |
19 |
26.5 |
| 9 Months |
18.5 |
19.5 |
29 |
| 12 Months |
19.5 |
19.5 |
31.5 |
| 18 Months |
20 |
20 |
34 |
| 24 Months |
20.5 |
20.5 |
36.5 |
| 3 Years |
21.5 |
21 |
38.5 |
| 4 Years |
22.5 |
21.5 |
41 |