I got my daughters done at around 2 months. Here were my two reasons:
First, I asked my pediatrician, and she said the younger the better. They won’t play with them (less infection risk) you can make sure they are cleaned, and it will hurt less when they are younger (less emotional ‘pain’ or fear). Modern sterile methods with disposable ear piercing earrings make it more desirable and better done as an infant. This is true because mommy is caring for them. How do they really do having it done as babies? Well, she cried just long enough for me to pick her up, and it was over. she is 10 months, and we have never had any issues.
Second, why did I decide to have our dd's ears as an infant vs older? Well, I kept seeing more and more babies and little girls with cute earrings and that pushed me to go ahead. I followed our ped's tips on finding the right place, type of earrings to use and aftercare of newly pierced ears. I took her to Piercing Pagoda and she did fine and looks adorable.
Any moms wanting our ped's suggestions, drop me an e-mail.