I can't imagine why you'd want anyone to be there who didn't have to be. A friend of mine had a baby yesterday. Last week they were asking if anyone had a camcorder they could borrow to video the birth. EWW!!!! Who would EVER want to watch that film? Except possibly the mother when she's contemplating a second and needs to remember how hideous it was...

I think Harry would find it traumatic too, though I think Ron would take it in his stride. Only for Hermione though. I can't see him as anyone else's midwife of choice!