As others have said it's up to you. When my eldest was an infant I pierced her ears (I know how). She grew up to wear earrings frequently and has had no problems with the earrings. I pierced my middle daughter and youngest daughter when they were older - not infants but pre-school age - worst mistake. They pulled on the earrings and eventually I had to remove the earrings and of course it healed, closing the holes. When they became teens they wanted their ears pierced so a few months ago I pierced the middle one's ears and it's almost healed. The youngest just had her ears re-pierced a week or two ago and of course she's not doing a good job of taking care of the earrings - pushing the in so it's scabbing her ears and causing the skin to peel and the holes to become enlarged instead of tiny holes.
If you want to pierce her ears get it done by someone who is qualified to do so - best at a salon or beauty school versus a kiosk at the mall - and do it while she's young so she can't tug or play with the earrings.
