OK, this just goes to confirm. My kids have big feet.
Our dd is 3 years 4 months and has outgrown her size 10.5 sandals, so she must be 11.
Ds is 6 and wears a youth sized 4.
No wonder our neighbors keep passing on shoes that don't fit! They gave us a whole bag of ultra cute shoes just a couple of weeks ago that were size 9 and 9 1/2. Dd hasn't worn a 9 since January!