US	Inches	CM
Infant US 2	3 7/8	10
Infant US 2.5	4 1/4	10.7
Toddler US 3.5	4 3/4	11.9
Toddler US 5	5 1/4	13.2
Toddler US 6	5 3/8	13.8
Toddler US 7	5 7/8	14.8
Toddler US 8	6 1/8	15.7
Little kid US 9.5	6 3/4	17
Little kid US 10.5	6 7/8	17.6
Little kid US 12	7 1/2	18.9
Little kid US 13	7 3/4	19.9
Little kid US 13.5	8 1/4	20.8
Big kid US 1.5	8 1/2	21.5
Big kid US? 2.5	8 7/8	22.4