I am a new daycare provider and my new mom just told me today that her 12 month old had a bite mark on his arm last night. I am pretty sure that my friend's 23 month old must have done it yesterday when I was in another room. I heard him cry but thought that he may have been hit with a toy. I feel so bad and cannot stop thinking about it. Any words of advice or similar experiences. Thanks for your help and support.