IDO Baby sizes 0 - 30 month
| Approximate age | Brand size | Child's height (cm) | Child's chest (around) (cm) | Child's waist (around) (cm) | Child's weight (kg) |
|---|---|---|---|---|---|
| Newborn | 0 | 50 cm | 39 cm | 39 cm | 3. kg |
| 1 month | 1 | 56 cm | 41 cm | 41 cm | 4.2 kg |
| 1-3 month | 3 | 62 cm | 43 cm | 43 cm | 6 kg |
| 3-6 month | 6 | 68 cm | 45 cm | 45 cm | 8 kg |
| 6-9 month | 9 | 74 cm | 47 cm | 47 cm | 9.2 kg |
| 9-12 month | 12 | 80 cm | 49 cm | 49 cm | 10.2 kg |
| 12-18 month | 18 | 86 cm | 51 cm | 51 cm | 11.4 kg |
| 18-24 month | 24 | 92 cm | 53 cm | 52 cm | 12.6 kg |
| 24-30 month | 30 | 96 cm | 55 cm | 53 cm | 13.6 kg |
IDO Junior sizes 3 - 16 year
| Approximate age | Brand size | Child's height (cm) | Child's chest (around) (cm) | Child's waist (around) (cm) |
|---|---|---|---|---|
| 2.5 - 3 year | 3 | 98 cm | 56 cm | 53 cm |
| 3-4 year | 4 | 104 cm | 57 cm | 54 cm |
| 4-5 year | 5 | 110 cm | 59 cm | 56 cm |
| 5-6 year | 6 | 116 cm | 61 cm | 58 cm |
| 6-7 year | 7 | 122 cm | 64 cm | 60 cm |
| 7-8 year | 8 / S | 128 cm | 67 cm | 63 cm |
| 8-10 year | 10 / M | 140 cm | 71 cm | 65 cm |
| 10-12 year | 12 / L | 152 cm | 75 cm | 67 cm |
| 12-14 year | 14 / XL | 165 cm | 79 cm | 69 cm |
| 14-16 year | 16 / XXL | 170 cm | 82 cm | 71 cm |
IDO Boys trousers sizes 6 -16 years
| Brand size | Approximate age | Boy's height (cm) |
|---|---|---|
| 26 | 6 year | 116 cm |
| 28 | 7 year | 122 cm |
| 30 | 8 year | 128 cm |
| 32 | 9 year | 134 cm |
| 34 | 10 year | 140 cm |
| 36 | 11 year | 146 cm |
| 38 | 12 year | 152 cm |
| 40 | 13 year | 158 cm |
| 42 | 14 year | 164 cm |
| 44 | 16 year | 170 cm |
IDO Pre-walker shoes sizes
EU
| 
UK
| 
USA
| Approximate Age: | Foot length (cm) |
|---|---|---|---|---|
| 15 | 0 | 1 | 1 month | 9.5 cm |
| 16 | 1 | 2 | 3 month | 10.5 cm |
| 17 | 2 | 3 | 6 month | 11 cm |
| 18 | 3 | 4 | 9 month | 11.5 cm |
| 19 | 3.5 | 4.5 | 12 month | 12 cm |