This is a beautiful book; my son (3, awaiting dx, certainly on the spectrum) adores it and it makes me feel really positive. One tiny criticism: on the letter J (for jumping, jogging and jujitsu), the lower-case 'j' is in fact an 'i'; it doesn't simply look like one, when comparing it with others in the book. Now anyone with an obsessive child knows this is NOT a good thing! We altered ours with a black felt tip, and now everyone is happy. But that is a tiny (if funny) point, and the book really is the best.