As children's feet can grow at a different rate to others, the age group on our shoes is purely a guideline. Please use the measurements listed under each shoe discription when choosing the correct size. Sole measurements are taken from the outside of the shoes sole, therefore the inside measurement would be slightly smaller. If you have chosen the incorrect size we are more than happy to exchange the shoes for a different size (if available) as long as the shoes have not been worn/damaged and all packaging is intact. Return postage of original shoes to us and postage of new pair back to you is at  customer's cost.