There are a number of features designed into the growalong to allow for 6 month of growing compared to the traditional all in one babygrow. This includes; Extendable trouser leg through innovative waist feature! Foldable cuffs in the armPleated heel which gives room for little toes as they grow Double popped collar to give a wider circumference to go over headClick link below which will take you to our 'how to' section on our about growalong page: