In baby clothing, the size number is the baby’s height in centimetres. Month ranges are only averages, so checking height is the safest way to buy second-hand.
1. Size chart
Brands differ slightly, but the general chart is:
- Size 50: newborn (0–1 months)
- Size 56: 1–2 months
- Size 62: 2–4 months
- Size 68: 4–6 months
- Size 74: 6–9 months
- Size 80: 9–12 months
- Size 86: 12–18 months
- Sizes 92 and 98: 18 months – 3 years
2. Leave room to grow
Babies grow very fast in the first months. Buying seasonal clothes one size up lets you use the same piece longer.
3. Account for shrinkage
Cotton can shrink a little in the first washes. Second-hand clothes have usually been washed already, so they are more predictable.
4. Ask the seller for measurements
If the label is faded or cut off, ask the seller for length and chest measurements in cm. A photo taken flat also helps a lot.
Quick note: Go by your baby’s height, not the month range. If unsure, pick the next size up.