My elder son was also very prem, diagnosed with CP at birth, but hospital never bothered telling me this till he was 5 yrs old! By then, though it was a struggle, id patiently helped him to feed himself, and dress after a fashion, (but he couldnt read, write or anything till he was 8/9 ) but he got no DLA allowed either, because of being able to do so.He never got anything all his life, till 16, we applied for PIP, then had to go to appeal court, before they awarded him anything at 17.Even though he was born with it, and it will never 'heal' or 'get better'. What are these assessors and DWP departments thinking?! And if they asked him to undress at any assessment he would just freak out.