Kids develop at their own pace, but it's down to their teachers to keep them on track and help them in any way possible. So, if you have a kid that struggles with reading and writing in your class, you could help them by adding some LEGO bricks to your dollar store cart. But you're not doing the building... the kids are! In fact, all you need to do is print off some letter cards.
You should then ask the children to build the letters using the building bricks to get them more familiar with the shapes and sounds of these letters. It's also super fun for them.