OTT, in my culture, a lot of attention is paid to our ancestors. i.e. we believe that the ancestors will walk with you in spirit form at certain times of your life and that they are always around you. Just as there are good people and bad people on earth, there are also good and bad ancestors. The belief is that if you don't do things to ward off the bad ancestors or you don't do things to get the good ancestors to continue looking after you, then your life on earth will be more difficult. Paying heed to ancestors at the most important events of ones life is therefore important - so includes, births, marriages, new home and deaths. oh and even divorces! The belief is that the bad ancestoral spirit will try and enter a child's body and therefore return to earth. By piercing the ear the cultural belief is that they will pass through and the child will be protected. That is why it has to happen so quickly. In addition, it is very important that a child is named quickly, and similarly the ancestors are invoked on this day too. Oh and its important to name the child after a good ancestor as well, so that they will always protect you.
I hope that gives you insight. It is what happens in my culture but I believe from the brief conversations I have had with people from a wide variety of other cultures that the reasons are different.Aa child I was only ever allowed to wear plain studs and even now rarely deviate from that. DD has been given bracelets and necklaces as presents but doesn't wear any of them. Some lovely (English) friends have also given DD earrings that are slightly decorative. Again she doesn't wear them.
I agree with Electra re the observations that some people have made that having your ears pierced is on a par with female circumcision, which as she says has implications for all your adult life. If done correctly, and the ears are looked after correctly, the pain of ear piercing is never felt after the initial prick. My DD didn't even flinch when her ears were pierced (at one week) and didn't cry. Neither did she cry at her heel prick or 2 month jab. It's only at her 3 month jab that she cried.
Ear piercing comes up over and over on MN and each time, I get angry at the view tahat it is only ever done for one reason (for decoration and even on this thread it has been said that the cultural reason must be for decoration) but have never said anything before. I posted today because I thought it would be good to give a different viewpoint.