When trying to decide between two sizes, choose the larger size for a better fit.
| Size | Chest | Waist | Hips | Height | Weight |
| XS (0-6) | 18 | up to 18.5 | 18.5 | Up to 26 | Up to 16 lbs. |
| S (6-12) | 19 | 18.5 - 19.5 | 19.5 | 26 - 29.5 | 16-23 lbs. |
| M (12-18) | 19.75 | 19.5 - 20.25 | 20.25 | 29.5 - 32 | 23-27 lbs. |
| L (18-2T) | 20.5 | 20.25 - 21 | 21 | 32 - 34 | 27-30 lbs. |
