I agree with UpSheRises, there is a reason your daughter is biting your son, her brother. At 18 months I'm guessing it's because she's angry or frustrated with something he's done, and does not yet have the words to express herself. Is there a certain time of day she bites? Does she have a favorite toy that he keeps taking from her? Is he getting more attention than her? (not counting the comfort he gets after her biting him)
There is almost always a WHY behind the biting. At 18 months it's usually a frustration or anger over something and not having the words/vocabulary to get it out.
at 2:50 PM on Feb. 10, 2011