Best of Chums Size Guide
| Size | Age (in months/years) | Height (in inches) | Weight (in pounds) | |
| Baby (Sizes 3M-24M) | 3M | 0-3 Months | 20-23.5 | 8-12.5 |
| 6M | 3-6 Months | 24-25.5 | 13-16.5 | |
| 9M | 6-9 Months | 26-27.5 | 17-20.5 | |
| 12M | 9-12 Months | 28-30.5 | 21-23.5 | |
| 18M | 12-18 Months | 31-32.5 | 24-26.5 | |
| 24M | 18-24 Months | 33-34.5 | 27-30 | |
| Toddler / Younger Girls | 2T | 2 Years | 33-35 | 24-29 |
| 3T | 3 Years | 35-38 | 29-33 | |
| 4T | 4 Years | 39-41 | 33-37.5 | |
| 4 | 3-4 Years | 42-44 | 37.5-42 | |
| 5 | 4-5 Years | 45-47 | 42-46 | |
| 6 | 5-6 Years | 48-49 | 46-53 | |
| 6X | 6-7 Years | 50-52 | 53-58 |
| Size | Age (in months/years) | Height (in inches) | Bust (in inches) | Waist (in inches) | Hip (in inches) | |
| Older Girls | 7 | 6-7 Years | 51-52 | 26-27 | 23 | 29 |
| 8 | 7-8 Years | 53-54 | 27-28.5 | 23.5 | 30 | |
| 10 | 8-9 Years | 55-56 | 28.5-29.5 | 24 | 31 | |
| 12 | 10-11 Years | 57-59 | 30-31 | 24.5 | 32 | |
| 14 | 11-12 Years | 60-62 | 31-32 | 25 | 33 |