My sister sent me these photos with this caption:
In 1913 it was legal to mail children. With stamps attached to their clothing, children rode trains to their destinations, accompanied by letter carriers. One newspaper reported it cost fifty-three cents for parents to mail their daughter to her grandparents for a family visit. As news stories and photos popped up around the country, it didn’t take long to get a law on the books making it illegal to send children through the mail.
That may be true but according to Snopes.com these photos are staged. However there is a great children’s book called Mailing May that is apparently based on a true story. Set in 1914, A little girl travels by postal train to visit her grandmother. Much cheaper than buying a regular train ticket!