Convertible Footed Onesie Size Chart
| Size | Weight Range | Baby Length (in/cm) | Chest Width (cm) | Waist Width (cm) | Onesie Length (cm) |
| Newborn | 6-9 lbs | 19-21" (48-53 cm) |
20.5 | 20.5 | 29 |
| 0-3M | 9-12 lbs | 21-24" (53-61 cm) |
21.5 | 21.5 | 30.3 |
| 3-6M | 12-16 lbs | 24-26" (61-66 cm) |
23.5 | 23.5 | 33 |
| 6-12M | 16-22 lbs | 26-30" (66-76 cm) |
24 | 24 | 36.5 |
| 12-18M | 22-27 lbs | 30-32" (76-81 cm) |
24.8 | 24.8 | 40 |
| 18-24M | 27-30 lbs | 32-34" (81-86 cm) |
26 | 25.4 | 42 |