To add a bit more, I didn't really read until later, around 8, but then read at a fairly quick and passionate amount for my age. People thought I'd dodged my family curse but later around 10 it was shown I was quite behind at school. My dyslexia was described as "a defect in one aspect of intelligence", which for most kids is reading comprehension, but for me it showed in a lack of decent short term memory. As you say, learning disabilities are interesting issues to deal with, but I'm sure your son will do great with support like you around him.