Baby Onesie Size Guide
Inches
| WIDTH | BABY LENGTH | FITS WEIGHT (LBS) | |
| 3–6M | 9.4 | 20–25 | 12–16 |
| 6–12M | 9.9 | 25–28 | 16–22 |
| 12–18M | 10.4 | 28–30 | 22–27 |
| 18–24M | 10.9 | 30–32 | 27–30 |
Centimeters
| WIDTH | BABY LENGTH | FITS WEIGHT (KG) | |
| 3–6M | 22.9 | 50.8–63.5 | 5–7 |
| 6–12M | 22.9 | 63.5–71.1 | 7–10 |
| 12–18M | 25.4 | 71.1–76.2 | 10–12 |
| 18–24M | 27.6 | 76.2–81.3 | 12–14 |