millie has been biting (sometimes really chomping down) on my fingers while playing. the other day she had my finger so hard i thought she may have broken skin. thankfully, she hadn't. i do replace my fingers with a toy when she does this- but, she really enjoys fingers- and, i guess i'm wondering if this is typical and will it soon stop or will it move on into adult behavior? i'd like to get rid any bad habits before they become difficult to deter behaviors.