Please measure your child's feet from heal to toe in cm, add on 0.7cm for wiggle room then compare to the insole cm on each product shoe.
Have them stand on paper and mark the paper rather than directly measure the foot.
For example if your child's feet measure 11.cm add on 0.7cm you will need our size 2 shoe of 11.8cm.
If your child's feet measure 14.cm add on 0.7cm you will need our size 6.
Please contact firstname.lastname@example.org if you're still unsure.