When trying to decide between two sizes, choose the larger size for a better fit.
| Size | Chest | Waist | Height | Weight |
| 0-6 Months | 16.5-17.25 | 17-19 | 23-25 | 7-17 lbs |
| 6-12 Months | 17.75-18.25 | 19-20 | 25-29 | 17-22 lbs |
| 12-18 Months | 19 | 20-20.5 | 29-31 | 22-27 lbs |
| 18-24 Months | 20 | 20.5-21 | 29-31 | 27-30 lbs |
| 2T | 21 | 21 | 33-36 | 26 to 3lbs. |
| 3T | 21.75 | 21.5 | 36-39 | 30 to 34 lbs. |
| 4T | 23 | 22.5 | 39-42 | 34 to 39 lbs. |
