Bibi Size Chart [Kids B]This chart applies to the following Bibi styles:Agility Mini Boots. Get the perfect fit every time.1. Measure your child’s foot length2. Add 10 mm growth room3. Match that to the inner length of the size you need Bibi EU Size[Kids B]Our Aus Size Inner shoemeasurement [mm]246.5147258160268.5165279170289.51762911185 Bibi sizing can vary between different styles, so please use the right size chart for the style you are falling in love with and about to purchase. To make this easy, the styles are listed at the top of each of our Bibi size charts.