Infant Unisex Cotton Onesie Size Guide
| Size | Chest | Length Center Back | Fits Weight | Height |
| 3-6M | 18 3/4" | 17 3/4" | 12-16lbs | 20-25 |
| 6-12M | 19 3/4" | 19 1/8" | 16-22lbs | 25-28 |
| 12-18M | 20 3/4" | 20 1/4" | 22-27lbs | 28-30 |
| 18-24M | 21 3/4" | 21 3/8" | 27-30lbs | 30-32 |
**Note: Newborn and preemie sizes are not available in one piece. See infant t-shirt for 0-3M option.**