That seems like more of an ethical question. Chances are a fawn will be adopted by another doe that either didnt have a fawn or her fawn was killed by a car or predator. I passed a doe last year because she had a fawn with her. Later i was kicking myself, Its tough getting a deer in bow range at all around here. If the opportunity arises again this year I might just swallow it and send an arrow. Ultimately its up to you, but odds are the fawn will be ok.