Examples of good arch shoes are any from DVS Shoe Company, Keen Tuckee Shoes, and Tsukihoshi. Each company provides shoes for toddlers and children. You may also check into inserts such as Arch Angel shoe supports.
Never underestimate the importance of good shoes for your child. A good shoe with a firm sole will be your best bet. Spending a little more money and have your child's shoe fit by a professional. Make sure your child is also wearing a nice weight sock that is put on correctly.