a baby wearing earrings
I don't have earrings, my sister got them when she turned 18 years old. I'm not against it, but I think that a mom should think twice before she decided to get earrings for her little girls.
It's a good idea to wait at least 4 months old, after your girl will have her shots done. Cultural or religion preferences will probably end up dictating the decision one makes, and actually moms can take the choice away from their girls. If your daughter does have her little ears pierced, be certain you take the care and health of her ears seriously.