Side-by-Side Comparison
Shoe Sizes
Kids & Baby Shoes vs. Shoe Widths
Comparing 2 standards across 13 specifications. 13 key differences identified.
Comparing:
Kids & Baby Shoes
Shoe Widths
Kids and baby footwear sizing stages standardize four developmental age brackets: Baby/Infant (0–12 months, US 0.5–4), Toddler (1–4 years, US 4.5–10), Little Kid/Preschool (4–8 years, US 10.5–13.5), and Big Kid/Youth (8–12 years, US 1–7), transitioning seamlessly into adult footwear sizes.
Shoe width classifications standardize forefoot ball joint circumference and sole width relative to shoe length. Measured using the Brannock Device, widths span from 4A/AAAA (Super Slim) to 6E (Maximum Wide), with each letter step representing a 3/16-inch (4.76 mm) increase in ball circumference.
Specification Comparison Table
13 Parameters| Parameter / Spec | ||
|---|---|---|
|
Governing Standards
|
SATRA Footwear Standards / APMA Children's Sizing Guidelines | The Brannock Device / SATRA TM / ASTM F2413 |
|
Baby / Infant Stage
|
Age 0–12 Months | US 0.5 to 4 | EU 16 to 19 | Foot Length 8.3–11.4 cm | — |
|
Toddler / Walker Stage
|
Age 1–4 Years | US 4.5 to 10 | EU 20 to 27 | Foot Length 11.7–16.5 cm | — |
|
Little Kid / Preschool Stage
|
Age 4–8 Years | US 10.5 to 13.5 | EU 28 to 31 | Foot Length 16.8–19.1 cm | — |
|
Big Kid / Youth Stage
|
Age 8–12 Years | US 1.0 to 7.0 | EU 32 to 39 | Foot Length 19.7–24.8 cm | — |
|
Adult Transition Boundary
|
Youth Size 7 (US Big Kid 7) = US Men's 7.0 = US Women's 8.5 (25.0 cm foot) | — |
|
Growth Allowance Rule
|
Add 1/2 inch (12 mm) of thumb clearance space for growing feet | — |
|
Standard Medium Width (Men)
|
— | D (Medium / Standard fit for North American men) |
|
Standard Medium Width (Women)
|
— | B (Medium / Standard fit for North American women) |
|
Circumference Step Increment
|
— | 3/16 inch (0.1875" / 4.76 mm) per letter width step for a given length |
|
Narrow Width Scale
|
— | 4A (AAAA) | 3A (AAA) | 2A (AA) | A | B | C |
|
Wide Width Scale
|
— | E | 2E (EE / Wide) | 3E (EEE) | 4E (EEEE / Extra Wide) | 6E (Maximum) |
|
Proportional Width Rule
|
— | A Size 12B has the same physical width as a Size 10D and a Size 8EE |