Petit Ami Size Chart
*Note: This is a general sizing guide.
| Size | Height (in) | Weight (lbs) | Chest Circumference |
| Preemie | up to 19 | up to 8 | 15 |
| Newborn | up to 21 | up to 12 | 16 |
| 3m | 21-24 | 12-16 | 17 |
| 6m | 24-27 | 16-19 | 18 |
| 9m | 27-29 | 19-22 | 18.5 |
| 12m | 29-31 | 22-27 | 19 |
| 18m | 31-33 | 27-30 | 20 |
| 24m/2t | 33-36 | 30-33 | 21 |
| 3t | 36-38 | 34-38 | 22 |
| 4t/4 | 39-41 | 38-45 | 23 |
| 5 | 41-43 | 45-50 | 24 |
| 6 | 43-46 | 50-55 | 25 |
| 6x | 46-50 | 55 & up | 26 |