How to convert women's shoe sizes to youth(By Emily Reeves from sierra)
If you normally wear women's shoes and are trying to figure out what youth size would fit you best, the simple youth size to women's shoes conversion: your US size minus 2 or 1.5 = your youth size. So if you typically wear a US women's size 4, a big kids' size 2 would likely fit pretty well.
However better look at the eu sizes or the actual size in Cm/inches. If you wear a 4 and sometimes buys the older kids sizes but has to go off the eu sizes as it’s not a straight comparison. They might also a little tighter in forefoot where the laces start too but it usually eases after they’ve been worn a few times.
Astarshoes.com sell petite shoes for small feet women, size range from US 1 to US 5. If you have questions about what size shoe or your child needs, or how the youth sizes relate to adult women's shoe size, just reference there shoe size charts to find the perfect fit.