I think fawns are the sweetest looking babies out there.
Does will place their fawns in a safe (to them) place and leave them while they forage for food. If anyone finds a fawn alone, it is usually best to take a "watch and see" approach before disturbing or "rescuing" the baby. The majority of the time the mother will return for her baby. If in doubt, you can always call a wildlife rescue/rehab facility for advice (many hotline numbers can be found online). Obviously, if the fawn is in danger from traffic, dogs or other hazards, you would want to keep it safe. Sadly, many fawns become orphaned unnecessarily each spring because well meaning people think they are abandoned and "rescue" them.