Ses Petites Mains' sizing is based on a 'True-to-Size' fit.  Meaning, the average height & weight child will wear their year in our styles, i.e. an average sized 4 year-old can wear our size 4t.  However, if you have any questions regarding measurements or which size to order, we are more than happy to assist you, please email us at or call 415.533.1695.