I didn’t get my ears pierced as a baby and I always, always wanted them. My mother let me at age eight, but even though I realllllly wanted them, I was terrified. I only got them done when I was thirteen, and it was very painful for me. I still remember how much it hurt.
I suggest having it done as a baby. Even though Oomis brought up the point that you’re not getting the child’s consent, I have never met a girl who was upset that her parents pierced her ears as a baby.