How to measure inside leg:
- Ask your child to take off their shoes and stand straight, with their back against a wall.
- Place a book between their legs and slide it up the wall to meet the crotch firmly as if they are sat on a saddle.
- Make sure your child still has their heels on the ground, then mark with a pencil where the top of the book the touches the wall.
- Measure the distance from that mark straight down to the floor.