White-tailed Deer Fawn
White-tailed Deer (Odocoileus virginianus) Fawn just a little over an hour old

Mother deer very commonly leave their fawn alone, in a curled up position, while she feeds. If you see a fawn lying down without its mother, leave it alone. You may not see the mother during the day, but she is probably watching you. Stay away from the fawn so its mother will feel safe to return. If the fawn has not moved, or the mother has not returned by the next morning, please contact the wildlife rehabilitator closest to you. If the fawn is injured, there is a foul odor or flies around it, please contact the wildlife rehabilitator closest to you.
I found an injured deer flowchart
I found a fawn flowchart