Our smallest size is 3, and our largest is 12. We utilize blended sizing for the majority of our clothing, so in our line you'll find pieces that are size 3, 4/5, 6/7, 8, and 10/12. Our blended sizing is the average of the 2 sizes.
To break it down another way...
XXS - 3
XS - 4/5
S - 6/7
M - 8
L - 10/12
And if your kids are in between sizes, we recommend sizing up! Our sizing skews to the slimmer side (think, in between Gap and Crewcuts).