A youth medium size generally corresponds to the following measurements:
- Age: 8 to 10 years
- Height: 51 to 55 inches (129 to 140 cm)
- Chest: 26 to 28 inches (66 to 71 cm)
- Waist: 21 to 23 inches (53 to 58 cm)
- Hip: 27 to 29 inches (69 to 74 cm)
- Inseam: 19.5 to 21.5 inches (50 to 55 cm)
- Sleeve length (center back neck to wrist): 22.5 to 24.5 inches (57 to 62 cm)
These measurements are consistent across multiple youth size guides from 100% Europe and other apparel sources