Chest: Place the tape measure under your arms at the fullest part of your chest, wrap around your body until your fingers meet and mark the measurement.
Infant
| US Sizes | Chest (in) | Height (in) | Weight (lb) |
| 0-3M | 16-17 | 22-24 | 8-12 |
| 3-6M | 17-18 | 24-26 | 12-16 |
| 6-9M | 18-19 | 26-28 | 16-20 |
| 12M | 19-20 | 28-30 | 18-22 |
| 18M | 20-21 | 30-32 | 22-26 |
| 24M | 21-22 | 32-34 | 26-30 |
