Since the sizing is a bit confusing, here is some help...

These socks are sized in inches, the numbers will be about the length of the child's feet.

Here are some rough guidelines to help you choose the size:

Size 5-6 socks = Size 3 to 7-1/2 shoes = 1 to 2 years

Size 6-7 socks = Size 6 to 11-1/2 shoes = 1-1/2 to 4 years

Size 7-8 socks = Size 9 to 1-1/2 shoes = 3 to 7 years

Size 8-9 socks = Size 12 to 6-1/2 shoes = 5 to 10 years