All of our shoes are first-fit (before the baby starts to walk). To ensure that you get the correct size you should measure, with a sewing tape measure, the sole of the foot, from the big toe to the heel. Remember that the more the foot measurement adjusts to the size numbers that you will find below, the better the shoe will fit.
10 centimeters of sole (between 0 and 4 months approx.)
11 centimeters of sole (from 4 to 6 months approx.)
11.50 centimeters of sole (from 6 months to 8 months approx.)
12.50 centimeters of sole (from 8 months to 12 months approx.)