Uniformed Letter Carrier with Child in Mailbag (by Smithsonian Institution)
This city letter carrier posed for a humorous photograph with a young  boy in his mailbag. 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.

Uniformed Letter Carrier with Child in Mailbag (by Smithsonian Institution)

This city letter carrier posed for a humorous photograph with a young boy in his mailbag. 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.