I waited until 6 months, but that’s just me. I tried at 3 months, but my friend advised me to wait (he owns a tattoo shop and did all three of his daughters) All mommies are different, but I do recommend a shop with individual sterile needles vs a little kiosk 👍🏽
You can get them done after the first set of shots so 2 months at some stores but if you want to go to a piercing/tattoo parlor the child has to be able to give consent.