OK I'm an ear piercing junkie (though I have reached my limit) and I had my first holes done at 7 (i wanted them done when i was younger) and I had my mom reopen them a few times. I got my second holes done around 13 (and after a while they closed up too) with my mom's permission and they were redid for my JR. Prom and I added a cartilage piercing. Finally I got a thrid set in my lobe for my 19th birthday. ( and I wonder why I get earrings for my birthday and Christmas LOL )

I personally don't see any problem with younger kids getting their ear pierced but I think that if it's going to be done that both parents should agree on it. So I suggest putting off the baby's ear peircing days til both parents can agree that she's at the right age.