Just because dd and ds are taller, have bigger fit than the "average" child their age.
6 footers run in the family so I have tall, slim children who also happen to happen biggish feet.
For example ds who is 8.5 is in a size 3.5 shoe and size 10-11 clothes. His shoes from Clarkes cost me £36, £10 more than I normally pay (last year when he was in a size 2). Also was buying trainers for ds and I wanted a pair of Nike Airs. The difference between a 2.5 and 3 is about £30, it's shocking.
This is ludicrous and I think unfair that I am being penalised because genetically my children are tall.
I am not sure how there is a way round it though?