If there is one thing you don't need to worry about, it is if William can concentrate. Here he is "concentrating" on the TV like his dad.
Here he is staring at the picture of Marlin that he got to hang on the wall. His exact words, "I need to look at Marlin" and then he focuses in inches away from the picture.
This is him using scissors for the first time and I think every cell in his brain too (but not for the first time).