Just back from Podiatrist with DS1 - she has said that he is very hypermobile, and flat footed, is turning in one foot (which is why I took him) and a whole long list.
She said he also has hypermobile ankles and knees, and she suspects all over.
And that he is probably in pain a lot of the time, and that this is probably why he is always knackered and needs a buggy.
Getting inserts and have bought boots as advised, and will also be seeking a referral to the NHS podiatrist and physio (although the podiatrist was really surprised that the physio missed this at the MDT because it is very obvious apparently.)
Anyone any advice? Good exercises etc?