This also applies if you are a small, junior or petite size in womens clothing. Sometimes it can be less expensive to buy large or Xlg clothing in the children's section. :
UGG® Sizing Information | UGG® Official
UGG® Tasman II Casual Shoe - Little Kid / Big Kid - Chestnut | Journeys
Our Womens to Kids Shoe Size Conversion Chart Will Save You Money