I've noticed that quite a lot of the boys at Laura's school have fairly long hair. It seems to be becoming popular again. Why not just forget about haircuts for a while? OK, he may not look the way you want him to but as long as his hair's clean and brushed perhaps you could put up with it.
Knowing how perverse kids can be, he'll probably be demanding a haircut after a few months if he thinks you don't want him to have one.
