1913 - After parcel post service was introduced in 1913, at least two children were sent by the service. With stamps attached to their clothing, the children rode with railway and city carriers to their destination. The Postmaster General quickly issued a regulation forbidding the sending of children in the mail after hearing of those examples.
in the early 1950s programs were started to issue dog-tags to children. There was concern that in the event of a surprise atomic attack it would be difficult to identify the millions of children killed while at school.