Place your child's or baby's foot on a piece of paper in front of you.

With a pencil, trace around the foot. Hold the pencil as vertically straight as possible while tracing and ensure your pencil remains in constant contact with your child's foot while tracing around it.

With a ruler, measure your tracing to determine your child's foot length (the distance between the two longest points on your tracing).

Reduce this number by 5 mm. The result is your child's foot length and the number you will use to determine the slipper size.