All of our garments are sized as small, medium, large, etc - but some prefer to use numbered sizes for children's clothing. Here's a breakdown of how those numbered sizes correspond with the "named" sizes.
YXS/Youth Extra Small = size 2 - 4
YS/Youth Small = size 6 - 8
YM/Youth Medium = size 10 - 12
YL/Youth Large = size 14 -16
YXL/Youth Extra-Large = size 18 - 20