Were there toddlers fighting in WWI?

I saw this posted over at Facebook. It’s a bike that has been somehow engulfed into the side of a growing tree.

I did some quick google searches, and there’s vast discussion about it being a fake, but nobody, that I can tell, talks about the idea that a “boy” with a toddler-sized bike, locked his wheels up to the side of a tree in 1914 (America didn’t fire their first shot until October 1917, by the way), went off to war, and the U.S. forces didn’t send him home for being a goddamn “boy.”

The top of this should read, “Lest we forget” what year we went to war.