From "Interesting Facts"
You used to be able to send children through U.S. mail.
You can send a lot of things in the mail, but you can’t send a person — at least not anymore. There was nothing preventing people from mailing their own children in the early days of the U.S. Postal Service’s parcel post service, and at least seven families took advantage of it. That includes the Beagues, an Ohio couple who in 1913 paid 15 cents in postage to mail their newborn son to his grandmother’s house a mile down the road. Beyond the novelty of it — when the parcel post service began on January 1, 1913, some were eager to see which packages they could get away with sending — it was a surprisingly practical way of getting one’s kiddo from point A to point B.