DD is three months old and in the past few days she has been drooling buckets all of a sudden. She is also really fussy, which is highly unusual for her and is not nursing as often, although still when she gets hungry enough (diaper output is still good so far). She has really enjoyed having a little teething ring toy in her mouth (although she needs help to get it there). Are these signs that she is teething already?? I know that she is young but not unheard of. Or, is this just normal behavior and changes? I would appreciate any input.