Unless you come across a wild animal drowning or stuck on a fence,etc.....leave them alone if they are young. Their moms are just gone to get food. This is what they do!!!!!! There is no daycare in the forest, for pity's sake. If you see a baby bunny or fawn, go on your way.
http://globalnews.ca/news/2770152/what-is-fawn-napping-and-why-experts-are-concerned-its-increasing/?utm_source=Article&utm_medium=MostPopular&utm_campaign=2014
http://globalnews.ca/news/2770152/what-is-fawn-napping-and-why-experts-are-concerned-its-increasing/?utm_source=Article&utm_medium=MostPopular&utm_campaign=2014