This grow with me shorts length romper fits so many sizes by pulling the internal buttonhole elastic to shorten the torso. Your child slips it on through the crossover neck... plenty of room for even your potty-learning child to do so easily! For a slightly longer /drop crotch fit, simply lengthen the internal buttonhole elastic. Easy-peasy! On the pants / long sleeve version, it will also adjust by turning the leg bands and arm cuffs up to fit size!