Measure the belly circumference (just besides the armpits) and compare it with the following table (in centimeters).
| XXS | XS | S | M | L | XL | |
| Belly | 33-45 | 40-53 | 49-67 | 58-76 | 63-85 | 71-96 |
How to choose the right size? ↓
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Measure his/her belly
A tape measure would be fantastic but if you don't have any, you can use any cord and then check the length of the cord with a ruler.
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Check the results with the above table
Compare in the table above the number that you got when measuring his belly. That's the size you need!