The first and most obvious reason is that kids are still developing their bodies and may not be fully aware of the potential risks of getting a permanent tattoo. Tattoos can take months, even years, to heal properly, so if a child gets inked before they're ready, the ink could conceivably start to migrate, or scarring could occur. Additionally, tattoos often fade with time - meaning that if a kid decides to remove their tattoo later in life, it could be difficult or even impossible to do so without causing further damage.