I was conservative and didn't agree for my daughter to have her ears pierced until she was around 16. In my generation ear piercing was considered a sort of rite of passage. I also thought that the effect was permanent.
However my daughter had her daughter's ears pierced when she was a baby. At first I disagreed but then discovered that many other girls that age had pierced ears and they were cute. Taking care of them was easy because we did it at the same time we changed her diaper.
My granddaughter is now 9 and doesn't wear earrings. She's told me that she's a "tom boy" and doesn't want to wear girly things.
She had stopped wearing them a few years ago and the holes healed shut and the site was not visible. Then she wanted to wear them and so had to have her ears pierced again. I think she was 6-7 and did take care of them herself.
Piercing is not permanent! Inmates, who aren't allowed to wear any jewelry, keep broom straws in their ears so that they won't heal shut.
For anyone having their young child's ears pierced I recommend using earrings sized for a baby or young child. My daughter took her daughter to a place that only used adult sized studs and my granddaughter's ear lobes are bent some away from her head. It's possible that it wasn't the earrings that caused this but if I'd known it was a possibility I would've suggested that my daughter put in smaller earrings after the first few weeks.