You’re not allowed a tattoo before you are 18.....By the time your daughters 18 they will have found a different way to store the info. My dad said as i was forgetting to wear my necklace or bracelet to get a tattoo(he said it as a joke) . I didn’t realise you really could have it done.....But for one thing....you are making it harder for medics because if you get tattooes for conditions now medics will have to look all over the persons body to just see if one of their tattooes is a medical one.... Plus you need all the information and have the SOS sign tattooed on too so they recognise it...It would be a pretty big tattoo..Also if you have it on your wrist people can taken one look at you and think argh tattoo and not ask why you have one etc.Also you never know there may be a cure one day lol