Sorry if this has been done to dead but most links talks about babies. I agree with most of them that it's cruel. Personally (I think) I feel if a child is older enough to understand it hurts and older enough to look after their own ear fine. I would say that was about 6-7 (depends on the child).
Just intrested in people's view as my mother and father don't like piercings at all so I grew up with a very strong view on piercings. But then started seeing 7-8 with ears pierced at dd school, then dd 7 asking for hers to be done made me really think about it. But their is still a small part of my the programming from childhood their going not till she's 16-18.