I thought it was just a boy thing - but was reading on a bed wetting website that it could indicate other problems when dribbling after a wee and also the 'arc' of the wee should be like a bell???
Does your ds dribble?
My ds's pants always smell of wee by the end of the day - but again I thought it was just a boy thing and some of his friends 'dab' their willie after a wee with tissue paper and ds doesn't - so thought that had something to do with it too.