Please note that these are approximate measures. If you are not sure what size to get, measure your child's foot.
How to measure your child's foot:
Have your child stand on a piece of paper with his/her feet apart. Mark the end of his/her longest toe and the back of his/her heel. Have your child step off the paper. With a ruler, measure the distance between the heel mark and the longest toe mark. Go to the indicated chart, and choose a size that is at least 1/4" longer than your child's actual foot.
If your child has narrow feet, choose a size only 1/4" longer than his/her foot measurement.
If your child has wide and chunky feet, you may want to go 1/2" longer than his/her foot measurement.
For example, If your child's foot measures 5.25" long, you would then look at the Heirloom Boots chart, find your child's measure (see Heel to Toe line on our chart is the same as your child's foot measure); move one or two squares to the right on the US Size line above, the size your child would need would be a size 5.5 or 6-6.5.