Not necessarily. Typically, our insoles are meant to be worn continuously for a period of one year, after which, for most children, wearing them is no longer necessary as their brain has acquired the correct motor patterns for proper posture. In this case, the child will not need new insoles unless his/her size changes drastically within the year. To prevent this, we suggest choosing a slightly larger size from the get-go. In exceptional cases, the insoles will be recommended to be worn or longer than a year. To find out whether this applies to you, we highly recommend booking an online consultation with our posture expert Annette Verpillot here: https://posturepro.co/online-consult/ If the exception applies, it is ideal to opt for a new size when the shoe size changes significantly. Size Guide available here: https://bit.ly/3k0XtWY