On average children’s feet grow at two sizes per year in the first four years of life, and one size per year thereafter until growth is complete. However, a child’s foot may not grow for a considerable period of time and then grow several sizes in a relatively short period. To ensure that shoes still fit properly for length and width, a trained shoe fitter should check them every eight weeks. You may do this more frequently if you are aware that they are actively growing in height. Checking that your child's shoes fit properly is best done by the shop where the shoes were bought, ideally by a trained shoe fitter who will also measure the feet.
There are four main warning signs to look for when checking your child's feet:
Source: The College of Podiatry
Teaching your child how to tie their laces is not always easy! Below are 3 videos that may help you - they show different ways of tying shoe laces. All 3 videos are useful for both right and left handed children (and adults!).