Begin by grabbing a piece of paper, a pencil or pen and a ruler to measure the foot length.
Place the piece of paper hard up against the wall, with their heel also up against the wall (at the edge of the paper).
Next, trace the precise shape of your baby's foot. Make sure their toes are out straight, and not curled.
Be sure to keep your drawing utensil directly up and down, and not angled.
Finally, once you have traced their exact foot shape... use a ruler to accurately measure the length of the foot.
Be sure to keep the ruler extremely straight.