i dont advise ear piercing for babies n kids so young.
for babies, i dont see a need to pierce their ears. unless religion issues (but not that i know of).
cos they r so young, n they might just pull their ears, rub against it hardly, n if you never treat it or look after it properly, it might lead to infection.
for me i will just wait til pin wants to have her ears pierced, even now, i will also wait til she is at least 5-6 yo.