| Size | Weight | Height |
| PRE (preemie) | up to 5 lb | up to 18" |
| NB (newborn) | 5 - 8 lb | up to 21" |
| 0 - 3M | 8 - 12 lb | 21.5 - 23" |
| 3 - 6M | 12 - 16 lb | 23.5 - 26" |
| 6 - 9M | 16 - 19 lb | 26.5 - 28" |
| Sizes 9 - 12M & up snug fit - Footies & coveralls only* | ||
| 9 - 12M | 19 - 22 lb | 28.5 - 30" |
| 12 - 18M | 22 - 27 lb | 30.5 - 32" |
| 18 - 24M | 27 - 30 lb | 32.5 - 34" |
