- Let your child wear normal socks and no shoes
- Place both feet on a blanco piece of paper against the wall
- Paper and heels should be placed securely against the wall
- Make the child stand up straight, knees bent a little
- Mark the longest part of the feet (either the first, or second toe)
- Measure the distance as shown
- Use the size converter to choose the correct size, choose the shoe size that fits the bigger foot.

Or you can use Pitter-Pad; an iPad App that measures children shoe sizes. It features an easy to use step-by-step interface that accurately measures each foot’s length and width.

Please keep in mind:
- Most children feet grow two sizes a year
- Allow new shoes to be 12-16 mm bigger than the longest toe
- Shoes that are only 5mm longer should be regarded as too short and be replaced

Tips for healty, happy feet:
- Remember to check your child`s shoe size often, at least twice a year.
- Wash children’s feet daily & dry them carefully. Also between those little toes!
- Regularly trim the toenails, but never cut down the side of the nails or cut them too short.
- Give you’re child’s feet a regular check-up: check toenails and check for any signs of redness, irritated skin and/ or rubbing.
- Don’t forget to check their socks: a good sock should fit & breathe just like a good shoe. Cotton or wool are good materials. Go for at least 60% cotton.
- When possible: go barefoot!

source:

size converter: Wikipedia.org / Claus Färber