But when the parcel service began, all kinds of cargo showed up in the mail stream, including coffins, eggs, dogs and, in a few cases, human young.
According to National Postal Museum historian Nancy Pope, the first known case of a mailed baby was in 1913 when Mr. and Mrs. Jesse Beauge of Glen Este, Ohio, shipped their 10-pound infant son to his grandmother’s home about a mile away, paying 15 cents in postage and springing for $50 in insurance (because they were worriers). Records do not indicate whether Grandmother Beauge received her mail in a mailbox or through a letter slot.
Mail that baby: A brief history of kids sent through the U.S. Postal Service – The Washington Post
Sadly, in 1914 the USPS enacted a “no humans through the mail” policy. This is why we can’t have nice things.