Mine were done for me somewhere between 6 weeks and 6 months (I forget what mum told me)
I personally think its cute, and they can always take them out later.
One thing to note, don't forget to change the earings regularly as bubbah grows. Mine didn't get changed between 2 and 6 - I never took them out until I had PE classes at school... we had to use plyers to get them off, which was not pleasant - I remember lol