Our sizes are standard, European. Do you know your child's height? Be guided by it.
For example, if your child is 124 cm tall, you can choose size 122-128 and then the leggings will be just right for now. Or take a size higher than 128-134, then the leggings will be enough. The legs will be slightly wrinkled at the bottom, but they should not fall down at the waist from the bottom.
However, if you know that your child is slim, do not risk choosing a larger size and choose a size for now to get the effect of fitted leggings. And if you know that your child has a larger belly, focus on ensuring that the waist is not too tight and then choose a size higher than the height would indicate.

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