All models are available in sizes Small, Medium, Large and Extra Large. Except for Boumy OUTDOOR and Winter Boots. These are only available in sizes Medium, Large and Extra Large. It's best to measure the length of your baby's foot and then check the sizing chart.
| Boumy Shoe & Bootie models |
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| Size | Age | Inside measure sole |
Size |
| Small | 0-6 months | 11,5 cm. | 17 |
| Medium | 6-12 months | 12,5 cm. | 19 |
| Large | 12-18 months | 13,5 cm. | 21 |
| Extra Large | 18-24 months | 14,5 cm. | 23 |
Big Boumy's |
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| Size | Age | Inside measure sole |
Size |
| Small | 2-3 yrs | 16 cm. | 24 |
| Medium | 3-4 yrs | 17 cm. | 25 |
| Large | 4-5 yrs | 18 cm. | 26 |
| Extra Large | 5+ yrs | 19 cm. | 27+ |
Boumy OUTDOOR & Winter Boots |
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| Size | Age | Inside measure sole |
Size |
| Medium | 6-12 months | 12,5 cm. | 19 |
| Large | 12-18 months | 13,5 cm. | 21 |
| Extra Large | 18-24 months | 15 cm. | 23 |