I found this idea from a wonderful blog called Caleigh's Cornor. After reading this post, I decided to try making my own key guard out of glue sticks for one of my students. All I did was hot glue glue sticks into a grid panel that wrapped around the back of the IPad. You can set up your grid to slide off the IPad, or you could even use Velcro dots. I would suggest using the thinner glue stick and maybe even some super glue if your child or student has a strong grip.
You can buy key guards, as well. Some of the guards are smaller and more durable. This was my attempt at trying out a key guard. I did not want to spend the money on a key guard without knowing how my student would respond.