I remember reading this story from a couple years ago: http://www.pennlive.com/midstate/index.ssf/2015/03/union_cou...

Apparently if a child is very young, the water is extremely cold, and everyone involved is extremely lucky then crazy stuff can happen. (Un?)Fortunately this isn't something that happens often enough that we can get a lot of data on how the body can recover from stuff like this.