Hamish seems to stutter every now and then as well, its not all the time, but he gets quite frustrated when the words wont come out.
It seems to be he has a great idea in his head and he is trying to think of the right words to use to explain it so we will understand him. He has a great vocab and can hold a great conversation .
Its like a light bulb comes on in his head and he has this great idea he has to tell us but hes not sure how to say it.