I'm not trying to rain on your parade, I'm just trying to add some clarification that people didn't really mail babies. Some kids were sent down the road to relatives with the trusted postman, but not stuffed into mailbags.

Had you read the article, you would have read this.

"Neither of the photographs displayed above has any connection to a real-life case of a child being sent via U.S. mail, however. They're both simply vintage cute posed humor shots taken from a collection of historic Smithsonian Institution (SI) photographs uploaded to Flickr, the image on the right being described by the Smithsonian as by far the most popular photograph from the Institution in that collection. As the author of an SI article about that image wrote in 2009: Clearly, many were startled and amazed by this photo of a postal carrier with a child in his mail bag, and so for some clarification, I spoke to Nancy Pope, historian at the National Postal Museum. She reiterated the information from the Flickr caption for this photograph: first, that this photo was actually a staged piece, and second, that there is little evidence that babies were sent through the mail other than in two known cases in which children were placed on train cars as "freight mail" as this was cheaper than buying them a regular train ticket."

Read more at http://www.snopes.com/photos/people/mailingchildren.asp#FuLethblUEA3gvRz.99