When trying to decide between two sizes, choose the larger size for a better fit.
| Size | Size/Age Range | Chest | Height | Weight |
| 0-6 Months | Newborn-6 months | 8 3/4" | 12 1/2" | 5.0 oz |
| 6-12 Months | 6 Months-12 Months | 9 3/4" | 13 1/2" | 5.0 oz |
| 12-18 Months | 12 Months-18 Months | 10 3/4" | 14 1/2" | 5.0 oz |
| 18-24 Months | 18 Months-24 Months | 11 3/4" | 15 1/2" | 5.0 oz |
| 2T | 2 Years | 13" | 15 1/2" | 4.5 oz |
| 3T | 3 Years | 14" | 16 1/2" | 4.5 oz |
| 4T | 4 Years | 15" | 17 1/2" | 4.5 oz |