My two-year-old's social security card was stolen out of our mailbox after she was born. In spite of the theft they denied her a new number but sent another copy of the old one, which we received. Every year I worry that someone is using her number to defraud the IRS at tax season, and I file very early because of that. Or maybe they're trying to work under her name or build credit. I don't know. All of this was preventable, though.