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View compareSize Guide
Age is only a starting point — every child grows differently. Use height and weight alongside age for the most reliable fit, especially for anyone between two sizes. Once you've got the size sorted, our essentials checklist helps you plan what to actually buy.
| Age | Height (cm) | Weight (kg) | Chest (cm) | UK Size |
|---|---|---|---|---|
| 0–3 months | 50–62 | 3.5–6.0 | 40–44 | 0–3M |
| 3–6 months | 62–68 | 6.0–8.0 | 44–46 | 3–6M |
| 6–12 months | 68–76 | 8.0–10.0 | 46–48 | 6–12M |
| 1–2 years | 76–92 | 10.0–13.0 | 48–52 | 12–24M |
| 2–3 years | 92–98 | 13.0–15.0 | 52–54 | 2–3Y |
| 3–4 years | 98–104 | 15.0–17.0 | 54–56 | 3–4Y |
| 4–5 years | 104–110 | 17.0–19.0 | 56–58 | 4–5Y |
| 5–6 years | 110–116 | 19.0–21.5 | 58–60 | 5–6Y |
| 6–7 years | 116–122 | 21.5–24.0 | 60–62 | 6–7Y |
| 7–8 years | 122–128 | 24.0–27.0 | 62–64 | 7–8Y |
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How to measure at home
Height
Stand your child against a flat wall, heels touching it, and mark where the top of their head reaches. Measure from the floor to that mark.
Chest
Wrap a soft tape under the arms, around the fullest part of the chest, keeping it level and snug but not tight.
Weight
Use your child's most recent check-up weight, or weigh yourself holding them and subtract your own weight.
Between two sizes? Size up rather than down — clothes with a little room last longer through a growth spurt, and it's a more comfortable fit day to day than something snug. Still not sure? Ask our team and we'll help you pick.