Carrying on from the point we mentioned above, it can really be a catastrophe to have your children lost in a crowded space. Not only do you have no clue about where they could be, but you're also dependent on the sense of judgment of other individuals in the crowded place to locate your child and get them back to you somehow.
However, there is an alternative to the option for a bracelet that we mentioned above, and it is a removable tattoo. Removable tattoos are easy to alter and they can easily be removed or put on. You can have a small message and your number printed on these tattoos to ensure that your children are tagged with your contact information. Anyone who finds them with these tattoos would then contact you (hopefully).