I'd say it's ok to do this at a young age, I had mines at the age 7 or 8 and it hurt, but given that, my ears are sensitive. I didn't like the feeling of that, plus I dont see why not? Eventually if they don't like, their ear holes will slowly close, my mother has told me this because she did my sister's ear pierced at a young age (months or so) and asked her why I (At that time) didn't have my ears pierced. I can see where some of us come from, but like every decision, the children will decide if they want to continue wearing earrings or not
I'd say it's ok for a baby girl but for a boy, when they get older, it should be up to them
