It is an outdated procedure than has the potential to cause all manner of issues, damage and problems. Most places that perform the procedure are using piercing guns which are unsterile and use far too much force leading to the risk of infection and damage to the ear lobe which can leave scarring and extreme discomfort for the child. This is all done purely for the parents vanity and has absolutely no benefit to the child. It is injuring and causing pain to a infant against their will, which when looking at the definition of physical abuse does indeed create an accurate description. Yes it is momentary, no they will not remember it, but is this the point? There would be uproar if it was done to dementia patients who wouldn't remember it, yet for a small and helpless child it is still deemed acceptable by today's standards. There should be a limit on it, I would recommend a limit of 5 years old as at least at that point a child can verbalise and communicate and make their own decision with regards to their own body.
Piercings are completely dated. The new generation is full of branding, piercings and tattoos. Infants who get their ears pierced do not have any problems growing up. We are blowing this up to proportions that don't make sense. We are not piercing the infants belly button or tongue, we are simply piercing a thin layer of skin on their earlobe. Doctors and certified piercers are the ones doing the piercings with sterilized and certified equipment. If the baby receives any sort of infection its because their parents probably bought a home kit and did it themselves. This debate is meaningless because there's no big issue here to solve. The piercing of infants ears is completely harmless and there should not be an age limit.