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. :
Do UGG Boots Run Big or Small?
UGG® Neumel II Chukka Boot - Little Kid / Big Kid - Chestnut | Journeys
Envy Fine-Clothing - Kids Uggs can convert into women's sizes! | Facebook
UGG® Jona Boot | Nordstromrack
How to find the youth equivalent of women's shoe sizes | Sierra Blog
Kids' Boots Similar to Uggs | The Top 3 Stylish, Comfortable, Durable, and Affordable Alternatives! | Fitting Children's Shoes
UGG® Kids' Tasman II Suede Slippers (Youth) | Dillard's