I understand for some it is done for cultural and/or religious reasons, while I may not agree with inflicting the pain of piercing on a small child, I respect that sometimes beliefs/rituals are important to carry out.
I personally waited until my children were old enough to know what it entailed, make the decision themselves and it wasn’t going to be a safety hazard. I have always viewed piercings as part of being an adult, a bit like tattoos...so it looks odd to me when young children have ear piercings.
Although, I did take my younger brother to have his ear pierced. I was at high school and he was about 6/7...the lady on the market had no objections, no consent form and no aftercare. My parents were really upset...but I repeated what I told the piercing lady...he really wanted his ear pierced or a goldfish.