Height is the most reliable guide for children's clothes. Age works too. Measure them lying down or standing against a wall, heel to crown.
Sizes vary a little between brands. If they are between two sizes, take the bigger one.
| Size | Height | Weight |
|---|---|---|
| Newborn | 44–55 cm | 2.5–4 kg |
| 0–3 months | 55–62 cm | 4–6 kg |
| 3–6 months | 62–68 cm | 6–7.5 kg |
| 6–9 months | 68–74 cm | 7.5–9 kg |
| 9–12 months | 74–80 cm | 9–10.5 kg |
| 12–18 months | 80–86 cm | 10.5–12 kg |
| 18–24 months | 86–92 cm | 12–13.5 kg |
| 2–3 years | 92–98 cm | 13.5–15 kg |
| 3–4 years | 98–104 cm | 15–17 kg |
| 4–5 years | 104–110 cm | 17–19 kg |
| 5–6 years | 110–116 cm | 19–21 kg |
| 6–7 years | 116–122 cm | 21–24 kg |
| 7–8 years | 122–128 cm | 24–27 kg |
| 8–9 years | 128–134 cm | 27–30 kg |
| 9–10 years | 134–140 cm | 30–34 kg |
| 10–12 years | 140–152 cm | 34–42 kg |