I believe the answer to that would be up to the person actually doing the piercing... But here's a thought Walmart or Claire's would be able to help you with no issue...
The piercing guns are garbage and all piercing should be done by pros in a sterile environment.
Would be far better getting them pierced by an actual piercer. I am sure they would pierce a 7 month old here!
I pierced ears at walmart for 6 years. Lots of infants. More appropriate, I believe. Or...you can buy the kit & do it yourself.
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