CrocsBayaband unisex-child Bayaband Clog T

What size I should choose if he have an 8" feet?

My kid is wearing 13 little kid, after that comes number 1, 2, 3 etc. Is it 2 Little kid correct or it has to be only number 2, or 2 big kid??

My four year old is a size 11 in toddler. What is his size in little kid?

My kid is wearing 13 little kid, after that comes number 1, 2, 3 etc. Is it 2 Little kid correct or it has to be only number 2, or 2 big kid??