If you find a young fawn hiding in the grass or woods, it is probably just waiting for mom to return. Deer will leave their fawns for hours at a time while they are off foraging.
Please do not pick up a fawn unless you know for sure that it has been orphaned or it is injured.
Leave it alone and leave the area. The mother will not return if you are there and it is much better for the fawn to be raised by the doe.