Size Guide
Age-Based Size Conversion Chart:
| Age Range | UK Size | US Size | EU Size | Chest (inches) | Length (inches) |
|---|---|---|---|---|---|
| Newborn | Newborn | NB | 50 | 16 | 17 |
| 0-3 months | 0-3M | 3M | 56-62 | 17 | 18 |
| 3-6 months | 3-6M | 6M | 62-68 | 18 | 19 |
| 6-9 months | 6-9M | 9M | 68-74 | 19 | 20 |
| 9-12 months | 9-12M | 12M | 74-80 | 20 | 21 |
| 12-18 months | 12-18M | 18M | 80-86 | 21 | 22 |
| 18-24 months | 18-24M | 24M/2T | 86-92 | 22 | 23 |
| 2-3 years | 2-3Y | 3T | 92-98 | 23 | 24 |
| 3-4 years | 3-4Y | 4T | 98-104 | 24 | 25 |
| 4-5 years | 4-5Y | 5T | 104-110 | 25 | 26 |
Last updated on July 5, 2025.