Size Guide
Finding the right fit for a growing baby isn't always straightforward — they double in size in the first year alone. This guide gives you the standard weight and height ranges for each size, plus the exact garment measurements for every style we make.
How our sizes work
Our sizes follow standard baby age ranges, calibrated to fit the way babies actually grow. When in doubt, size up — bamboo has natural stretch, and a slightly roomy fit means longer wear.
General size chart
Use your baby's current weight and height as the starting point — age is just a rough indicator.
| Size | Weight | Height | Age (guideline) |
|---|---|---|---|
| Newborn (NB) | Up to 8 lbs / 3.6 kg | Up to 21.5" / 55 cm | 0 weeks |
| 0–3M | 8–12.5 lbs / 3.6–5.7 kg | 21.5–24" / 55–61 cm | 0–3 months |
| 3–6M | 12.5–17 lbs / 5.7–7.7 kg | 24–26.5" / 61–67 cm | 3–6 months |
| 6–9M | 17–21 lbs / 7.7–9.5 kg | 26.5–28.5" / 67–72 cm | 6–9 months |
| 9–12M | 21–24 lbs / 9.5–10.9 kg | 28.5–30.5" / 72–78 cm | 9–12 months |
| 12–18M | 24–28 lbs / 10.9–12.7 kg | 30.5–32.5" / 78–83 cm | 12–18 months |
These ranges are guidelines based on standard North American baby sizing charts. Every baby grows differently — the garment measurements below are the source of truth for actual fit.
Bamboo Zippered Romper
Garment measurements laid flat. Actual dimensions may vary by up to ±1 cm.
| Size | Full Length | Chest Width | Sleeve Length |
|---|---|---|---|
| NB | 50 cm / 19.7" | 22.5 cm / 8.9" | 26.1 cm / 10.3" |
| 0–3M | 54 cm / 21.3" | 23 cm / 9.1" | 29.5 cm / 11.6" |
| 3–6M | 58 cm / 22.8" | 23.5 cm / 9.3" | 31 cm / 12.2" |
| 6–9M | 62 cm / 24.4" | 24 cm / 9.4" | 32.5 cm / 12.8" |
| 9–12M | 66 cm / 26.0" | 24.5 cm / 9.6" | 34.5 cm / 13.6" |
| 12–18M | 71 cm / 28.0" | 25 cm / 9.8" | 37 cm / 14.6" |
How to measure
If you'd rather compare to a garment you already own, lay it flat on a hard surface and use a soft measuring tape:
- Full Length — from the top of the shoulder to the hem
- Chest Width — across the chest, from underarm to underarm
- Sleeve Length — from the shoulder seam to the cuff
Still not sure?
When in doubt, size up. Bamboo stretches, babies grow fast, and a slightly loose fit is much more comfortable than one that's too small.
Have a question about a specific style? Reach out — we're always happy to help.